2012 Mercedes-benz CLS Class Owners Manual

components on the circuit and their functions stop operating. G WARNING Only use fuses approved by Mercedes-Benz with the specified amperage for the system in question and do not attempt to repair or bridge a blown fuse. Using other than approved fuses or using repaired or bridged fuses may cause an overload leading to a fire, and/or cause damage to electrical components and/or systems. Have the cause determined and remedied by an authorized Mercedes-Benz Center.

Blown fuses must be replaced with fuses of the same rating, which you can recognize by the color and value. The fuse ratings are listed in the fuse allocation chart. An authorized Mercedes-Benz Center will be happy to advise you. i If a fuse has blown, contact a breakdown

service or an authorized Mercedes-Benz Center.

If the newly inserted fuse also blows, have the cause traced and rectified at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. ! Only use fuses that have been approved

for Mercedes-Benz vehicles and which

310 Fuses

have the correct fuse rating for the system concerned. Otherwise, components or systems could be damaged.

Before changing a fuse X Park the vehicle and apply the parking

brake.

X Switch off all electrical consumers. X Remove the SmartKey from the ignition

lock.

The fuses are located in various fuse boxes: Rfuse box in the engine compartment on the left-hand side of the vehicle, when viewed in the direction of travel

Rfuse box in the trunk on the right-hand side of the vehicle, when viewed in the direction of travel

The fuse allocation chart is located in the vehicle tool kit (Y page 294) in the stowage compartment under the trunk floor.

Fuse box in the engine compartment X Make sure that the windshield wipers are

turned off. G WARNING Make sure that the windshield wipers are switched off and that the SmartKey is removed from the ignition lock before you open the cover of the fuse box. Otherwise, the windshield wipers and the wiper rods above the cover could be set in motion. This could lead to you or others being injured by the wiper rods.

X Open the hood (Y page 280).

X Remove any existing moisture from the

fuse box using a dry cloth.

X Take lines ; from the guides. X Move aside lines ;. Route the lines behind

connection = to do this. X To open: open clamps :. X Remove the fuse box cover forwards. ! Make sure that no moisture can enter the

fuse box when the cover is open.

X To close: check whether the rubber seal is

lying correctly in the cover.

X Insert the cover at the rear of the fuse box

into the retainer.

X Fold down the cover and close clamps :. X Secure lines ; in the guides. ! The cover must be seated properly,

otherwise moisture or dirt could impair the function of the fuses.

X Close the hood (Y page 281).

Fuse box in the trunk X Open the trunk lid (Y page 82).

X To open: release cover : at the top right

and left-hand sides with a flat object.

X Open cover : downwards in the direction

of the arrow.

Fuses

311

312

Useful information ............................ 314
Important safety notes .................... 314
Operation ........................................... 314
Winter operation ............................... 316
Tire pressure ..................................... 317
Loading the vehicle .......................... 325
Maximum load rating ....................... 329
Uniform Tire Quality Grading Standards .......................................... 330
Tire labeling ....................................... 331
Definition of terms for tires and loading ............................................... 335
Changing a wheel ............................. 338
Wheel and tire combinations ........... 339

313

314 Operation

Useful information

i This Operator's Manual describes all models and all standard and optional equipment of your vehicle available at the time of publication of the Operator's Manual. Country-specific differences are possible. Please note that your vehicle may not be equipped with all features described. This also applies to safety- related systems and functions.

i Please read the information on qualified

specialist workshops (Y page 22).

Important safety notes

Consult an authorized Mercedes-Benz Center if you require information on approved and recommended tires and wheels for summer and winter operation. Advice on purchasing and caring for tires is also available there. G WARNING Replace rims or tires with the same designation, manufacturer and type as shown on the original part. For further information contact an authorized Mercedes-Benz Center. If incorrectly sized rims and tires are mounted, the wheel brakes or suspension components can be damaged. Also, the operating clearance of the wheels and the tires may no longer be correct. G WARNING Worn, old tires can cause accidents. If the tire tread is worn to minimum tread depth, or if the tires have sustained damage, replace them. When replacing rims, only use genuine Mercedes-Benz wheel bolts specified for the particular rim type. Failure to do so can result in the bolts loosening and possibly an accident. Retreaded tires are not tested or recommended by Mercedes-Benz, since previous damage cannot always be

recognized on retreads. The operating safety of the vehicle cannot be assured when such tires are used. G WARNING If you feel a sudden significant vibration or ride disturbance, or you suspect that possible damage to your vehicle has occurred, you should turn on the hazard warning flashers, carefully slow down, and drive with caution to an area which is a safe distance from the road. Inspect the tires and the vehicle underbody for possible damage. If the vehicle appears unsafe, have the vehicle towed to the nearest authorized Mercedes-Benz Center or tire dealer for repairs. G WARNING Do not drive with a flat tire. A flat tire affects the ability to steer or brake the vehicle. You might lose control of the vehicle. Continued driving with a flat tire or driving at high speed with a flat tire will cause excessive heat build- up and possibly a fire.

i Further information about Tires and

wheels can be obtained from any authorized Mercedes-Benz Center.

Operation Notes on driving RIf the vehicle is heavily laden, check the tire pressures and correct them if necessary. RWhen parking your vehicle, make sure that the tires do not get deformed by the curb or other obstacles. If it is necessary to drive over curbs, speed humps or similar elevations, try to do so slowly and at an obtuse angle. Otherwise, the tires, particularly the sidewalls, can get damaged.

Notes on regularly inspecting wheels and tires G WARNING Regularly check the tires for damage. Damaged tires can cause tire inflation pressure loss. As a result, you could lose control of your vehicle. Worn, old tires can cause accidents. If the tire tread is worn to minimum tread depth, or if the tires have sustained damage, replace them.

RRegularly check the wheels and tires of

your vehicle for damage (e.g. cuts, punctures, tears, bulges on tires and deformation or cracks or severe corrosion on wheels) at least once a month, as well as after driving off-road or on rough roads. Damaged wheels can cause a loss of tire pressure.

RRegularly check the tire tread depth and

the condition of the tread across the whole width of the tire (Y page 315). If necessary, turn the front wheels to full lock in order to inspect the inner side of the tire surface.

RAll wheels must have a valve cap to protect the valve against dirt and moisture. Do not mount anything onto the valve (such as tire pressure monitoring systems) other than the standard valve cap or other valve caps approved by Mercedes-Benz for your vehicle.

RRegularly check the pressure of all the tires including the emergency spare wheel or the spare wheel, particularly prior to long trips, and correct the pressure as necessary (Y page 317).

Tire tread G WARNING Although the applicable federal motor vehicle safety laws consider a tire to be worn when the tread wear indicators (TWI) become visible at approximately 1/16 in (1.6 mm), we

Operation 315

recommend that you do not allow your tires to wear down to that level. As tread depth approaches 1/8 in (3 mm), the adhesion properties on a wet road are sharply reduced. Depending upon the weather and/or road surface (conditions), the tire traction varies widely.

Do not use tires that are excessively worn as the tire traction on wet road surfaces decreases significantly when the tread depth is less than 1/8 inch (3 mm). Tread wear indicators (TWI) are required by law. Six indicators are positioned over the tire tread. They are visible as soon as a tread depth of approx. 1/16 inch (1.6 mm) is reached. If this is the case, the tire is so worn that it must be replaced. The recommended tread depth for summer tires is at least 1/8 inch (3 mm). The recommended tread depth for winter tires is at least 1/6 inch (4 mm).

Bar marking : for tread wear is integrated into the tire tread.

Notes on selecting, mounting and replacing tires ROnly mount tires and wheels of the same

type and make.

ROnly mount tires of the correct size onto

the wheels.

RAfter mounting new tires, run them in at

moderate speeds for the first 60 miles

316 Winter operation

(100 km) as they only reach their full performance after this distance.

RDo not use tires that are excessively worn

as the tire traction on wet road surfaces decreases significantly when the tread depth is less than 1/8 inch (3 mm).

RReplace the tires after six years at the

latest, regardless of wear. This also applies to the emergency spare wheel/spare wheel.

The service life of tires depends on the following factors amongst other things: Rdriving style Rtire pressure Rmileage

MOExtended tires (tires with run-flat properties) MOExtended tires (tires with run-flat properties) allow you to continue driving your vehicle even if one or more tires are entirely deflated. MOExtended tires may be used only in conjunction with the activated tire pressure loss warning system or the activated tire pressure monitoring system and only on wheels specifically tested by Mercedes-Benz. You will find notes on driving with a flat tire in the "Breakdown assistance" section (Y page 302).

Winter operation Please bear the following in mind At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center. Observe the notes in the "Changing a wheel" section (Y page 338).

Driving with summer tires At temperatures below 45 ‡ (+7 †), the elasticity of summer tires and therefore also traction and braking capability are reduced considerably — equip your vehicle with M+S tires. Using summer tires at very cold temperatures could cause tears to form, thereby damaging the tires permanently. Mercedes-Benz cannot accept responsibility for this type of damage.

M+S tires At temperatures below 45 ‡(+7 †), use winter tires or all-season tires. Both types of tire are identified by the M+S marking. Only winter tires bearing the i snowflake symbol in addition to the M+S marking provide the best possible grip in wintry road conditions. Only these tires will allow driving safety systems such as ABS and ESP® to function optimally in winter, as these tires have been designed specifically for driving on snow. Use M+S tires of the same make and tread on all wheels to maintain safe handling characteristics. G WARNING M+S tires with a tread depth of less than 1/6
inch (4 mm) must be replaced immediately. They are no longer suitable for use in winter.

Always observe the maximum permissible speed specified for the M+S tires you have mounted. Once you have mounted the winter tires: X Check the tire pressures (Y page 321). X Restart the tire pressure monitor

(Y page 322). G WARNING If you use your spare wheel when M+S tires are mounted on the other wheels, be aware that the difference in tire characteristics

impairs cornering ability and reduces driving stability. Adapt your driving style accordingly. Have the spare wheel replaced by a normal wheel with an M+S tire at the nearest Mercedes-Benz Center.

Snow chains For safety reasons, Mercedes-Benz recommends that you only use snow chains which have been specially approved for your vehicle by Mercedes-Benz, or are of a corresponding standard of quality. ! On vehicles with AIRMATIC, you must

drive at raised vehicle level if snow chains have been mounted. The vehicle may otherwise be damaged.

! There is not enough space for snow

chains on some wheel sizes. Observe the information under "Tires and wheels" in the "Technical Data" section to avoid damage to the vehicle or the wheels.

ROnly use snow chains when driving on

roads completely covered by snow. Do not exceed the maximum permissible speed of 30 mph (50 km/h). Remove the snow chains as soon as possible when you are no longer driving on snow-covered roads.

RLocal regulations may restrict the use of snow chains. Applicable regulations must be observed if you wish to mount snow chains.

RSnow chains must not be mounted on

emergency spare wheels.

If you intend to mount snow chains, please bear the following points in mind: Ryou may not attach snow chains to all

wheel-tire combinations; see the information under "Wheel and tire combinations" in the "Wheels and tires" section.

Rmount snow chains only in pairs and only

to the rear wheels. Observe the manufacturer's installation instructions.

Tire pressure 317

! If snow chains are mounted on the front

wheels, the snow chains could grind against the bodywork or components of the chassis. This could result in damage to the vehicle or the tires.

! Vehicles with steel wheels: if you wish

to mount snow chains on steel wheels, make sure that you remove the respective wheels' hubcaps first. The hubcaps may otherwise be damaged.

i You may wish to deactivate

ESP®(Y page 63) when pulling away with snow chains mounted. This way you can allow the wheels to spin in a controlled manner, achieving an increased driving force (cutting action).

Tire pressure Tire pressure specifications G WARNING Follow recommended tire inflation pressures. Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect handling and fuel economy, and are more likely to fail from being overheated. Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are more likely to become punctured or damaged by road debris, potholes etc. Do not overload the tires by exceeding the specified load limit as indicated on the Tire and Loading Information placard on the driver's door B-pillar. Overloading the tires can overheat them, possibly causing a blowout. Overloading the tires can also result in handling or steering problems, or brake failure.

You will find a table of recommended tire pressures on the Tire and Loading Information placard on the B-pillar on the

318 Tire pressure

driver's side (Y page 325). You will find a table of tire pressures for various operating conditions on the inside of your vehicle's fuel filler flap. To test tire pressure, use a suitable tire pressure gauge. The outer appearance of a tire does not permit any reliable conclusion about the tire pressure. On vehicles equipped with the electronic tire pressure monitoring system, the tire pressure can be checked using the on-board computer. G WARNING Should the tire pressure drop repeatedly: Rcheck the tire for foreign bodies. Rcheck whether the wheel is losing air or the

valve is leaking.

Rmake sure that only a valve cap approved by Mercedes-Benz is installed on the tire valve.

Tire pressures that are too low have a negative effect on vehicle safety, which could lead you to cause an accident.

Only correct tire pressures when the tires are cold. The tires are cold when the vehicle has been parked for at least three hours or driven for less than 1 mile (1.6 km). The tire temperature changes depending on the outside temperature, the vehicle speed and the tire load. If the tire temperature changes by 18 ‡ (10 †), the tire pressure changes by approximately 10 kPa (0.1 bar/1.5 psi). Take this into account when checking the pressure of warm tires and only correct the tire pressure if it is too low for the current operating conditions. If you check the tire pressure when the tires are warm, the resulting value will be higher than if the tires were cold. This is normal. Do not reduce the tire pressure to the value specified for cold tires. The tire pressure would otherwise be too low. Observe the recommended tire pressure specifications for cold tires on the Tire and Loading Information placard on the B-pillar on the driver's side.

i The specifications given on the following Tire and Loading Information placard are examples. Tire pressure specifications are vehicle-specific and may deviate from the data shown here. The tire pressures applicable to your vehicle can be found on the Tire and Loading Information placard on your vehicle.

You will find recommended tire pressure specifications : for cold tires and for a fully loaded vehicle on the Tire and Loading Information placard. The tire pressure information is applicable to all tires mounted at the factory.

Important notes on tire pressure G WARNING If the tire pressure drops repeatedly, check the tires for punctures from foreign objects and/or whether air is leaking from the valves or from around the rim.

The tire temperature and pressure increase when the vehicle is in motion. This is dependent on the driving speed and the load. If you wish to drive at high speeds of 100 mph (160 km/h) or higher when this is allowed, use the tire pressure table on the inside of the fuel filler flap to set the correct tire pressures when the tires are cold. If the tire pressure is not set correctly, this can lead to an excessive build up of heat and a sudden loss of pressure.

For further information, consult a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. i Driving comfort can be impaired if the tire

pressure value recommended in the tire pressure table for speeds over 100 mph (160 km/h) is adopted.

Make sure that the tire pressure for normal speeds is adopted again. Additional specifications of tire pressure values for loads can also be found on the tire pressure table on the inside of the fuel filler flap. The tire pressure for emergency spare wheels can be found: Rprinted in yellow on the rim of the

emergency spare wheel

Rin the "Wheel and tire combinations" section (Y page 339) in this manual

Ron the Tire and Loading Information placard

on the B-pillar on the driver's side.

i Specifications shown in the examples of

tire pressure tables are for illustration purposes only. Tire pressure specifications are vehicle-specific and may deviate from the data shown here. Tire pressure specifications applicable to your vehicle are located in your vehicle's tire pressure table.

Unless stated otherwise, the tire pressures specified on the fuel filler flap apply for all tires approved for this vehicle.

Tire pressure table for all tires permitted for this vehicle by the factory (example)

Tire pressure 319

If a tire size precedes a tire pressure, the tire pressure information following is only valid for that tire size. The load conditions "partially laden" and "fully laden" are defined in the table for different numbers of passengers and amounts of luggage. The actual number of seats may differ.

Tire pressure table with tire dimensions (example) Some tire pressure tables show only the rim diameters instead of the full tire size, e.g. R18. The rim diameter is part of the tire dimension and can be found on the sidewall of the tire (Y page 332).

Underinflated or overinflated tires Underinflated tires G WARNING Follow recommended tire inflation pressures. Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect handling and fuel economy, and are more likely to fail from being overheated.

320 Tire pressure

Underinflated tires can: Rwear excessively and/or unevenly Radversely affect fuel economy Rfail from being overheated Radversely affect handling

Overinflated tires G WARNING Follow recommended tire inflation pressures. Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are more likely to become punctured or damaged by road debris, potholes etc.

Overinflated tires can: Radversely affect handling Rwear excessively and/or unevenly Rbe more likely to become damaged Radversely affect ride comfort Rincrease stopping distance

Maximum tire pressure G WARNING Never exceed the maximum tire inflation pressure. Follow recommended tire inflation pressures. Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect handling and fuel economy, and are more likely to fail from being overheated. Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are more likely to become punctured or damaged by road debris, potholes etc.

: Maximum permitted tire pressure

(example)

i The actual values for tires are specific to

each vehicle and may deviate from the values in the illustration.

When adjusting the tire pressures always observe the recommended tire pressure for your vehicle (Y page 317).

Checking the tire pressures Important safety notes G WARNING Follow recommended tire inflation pressures. Do not underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect handling and fuel economy, and are more likely to fail from being overheated. Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are more likely to become punctured or damaged by road debris, potholes etc. Do not overload the tires by exceeding the specified load limit as indicated on the Tire and Loading Information placard on the driver's door B-pillar. Overloading the tires can overheat them, possibly causing a blowout. Overloading the tires can also result in handling or steering problems, or brake failure.

Check the tire pressure at least once a month. Only check and correct tire pressures when the tires are cold (Y page 317).

Checking tire pressure manually To determine and set the correct tire pressure, proceed as follows: X Remove the valve cap of the tire that is to

be checked.

X Press the tire pressure gauge securely onto

the valve.

X Read the tire pressure and compare it with

the recommended value on the Tire and Loading Information placard on the B-pillar on the driver's side of your vehicle. X If necessary, increase the tire pressure to

the recommended value (Y page 317).

X If the tire pressure is too high, release air by pressing down the metal pin in the valve using the tip of a pen, for example. Then check the tire pressure again using the tire pressure gauge.

X Screw the valve cap onto the valve. X Repeat these steps for the other tires.

Tire pressure loss warning system (Canada only) Important safety notes While the vehicle is in motion, the tire pressure loss warning system monitors the set tire pressure using the rotational speed of the wheels. This enables the system to detect significant pressure loss in a tire. If the speed of rotation of a wheel changes as a result of a loss of pressure, a corresponding warning message will appear in the multifunction display. G WARNING If the Check Tire Pressure Soon message appears in the multifunction display, one or more tires are significantly underinflated. Stop the vehicle as soon as possible and

Tire pressure 321

inflate the tires to the pressure specified on the vehicle's Tire and Loading Information placard or (where available) in the tire pressure table. Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Check all tires when cold, including the spare tire, at least once a month. The tires should be inflated to the recommended pressure. This information can be found: Ron the Tire and Loading Information placard

on the B-pillar on the driver's side or

Rin the table for the tire pressure on the

inside of the fuel filler flap G WARNING The tire pressure loss warning system does not provide a warning for wrongly selected tire inflation pressures. Always adjust tire inflation pressure according to the Tire and Loading Information placard on the driver's door B-pillar or on the tire inflation pressure label located on the inside of the fuel filler flap. The tire pressure loss warning system does not replace regular checks of the tire inflation pressures since a gradual pressure loss in more than one tire cannot be detected by the tire pressure loss warning system. The tire pressure loss warning system is not able to issue a warning due to a sudden dramatic loss of tire inflation pressure (e.g. tire blowout caused by a foreign object). In this case bring the vehicle to a halt by carefully applying the brakes and avoiding abrupt steering maneuvers.

The function of the tire pressure loss warning system is limited or delayed if: Rsnow chains are mounted to your vehicle's

tires.

Rroad conditions are wintry.

322 Tire pressure

Ryou are driving on sand or gravel. Ryou adopt a very sporty driving style

(cornering at high speeds or driving with high rates of acceleration).

Ryou are driving with a heavy load (in the

vehicle or on the roof).

Restarting the tire pressure loss warning system Restart the tire pressure loss warning system if you have: Rchanged the tire pressure Rchanged the wheels or tires Rmount new wheels or tires X Before restarting, consult the Tire and

Loading Information placard on the B-pillar on the driver's side or the tire pressure table on the inside of the fuel filler flap to ensure the tire pressure in all four tires is set correctly for the current operating conditions.

X Observe the notes in the section on tire

pressures (Y page 317). G WARNING The tire pressure loss warning system can only give reliable warnings if you have set the correct tire pressure. If an incorrect tire pressure is set, these incorrect values will be monitored. A tire with insufficient pressure results in vehicle instability when driving, thus increasing the risk of an accident.

X Make sure that the SmartKey is in

position 2 (Y page 132) in the ignition lock. X Press the = or ; button to select the Serv. menu. X Press the 9 or : button to select Tire Pressure. X Press the a button. The Run Flat Indicator Active Press 'OK' to Restart message appears in the multifunction display.

If you wish to confirm the restart: X Press the a button. The Tire Pressure Now OK? message appears in the multifunction display. X Press 9 or : to select Yes. X Press the a button. The Run Flat Indicator Restarted message appears in the multifunction display. After a teach-in period, the tire pressure loss warning system will monitor the set tire pressures of all four tires.

If you wish to cancel the restart: X Press the % button. or X If the Tire Pressure Now OK? message appears, press 9 or : to select Cancel. X Press the a button.

The tire pressure values stored at the last restart will continue to be monitored.

Tire pressure monitor Important safety notes If a tire pressure monitor system is installed, the vehicle's wheels have sensors that monitor the tire pressures in all four tires. The tire pressure monitor warns you when the pressure drops in one or more of the tires. The tire pressure monitor only functions if the correct wheel electronics units are installed on all wheels. The tire pressure monitor has a yellow warning lamp in the instrument cluster for indicating pressure loss/malfunctions (USA) or pressure loss (Canada). Whether the warning lamp flashes or lights up indicates whether a tire pressure is too low or the tire pressure monitoring system is malfunctioning: Rif the warning lamp is lit continuously, the

tire pressure on one or more tires is

significantly too low. The tire pressure monitor is not malfunctioning.

RUSA only: if the warning lamp flashes for

60 seconds and then remains lit constantly, the tire pressure monitor is malfunctioning. G WARNING Each tire, including the spare (if provided), should be checked at least once a month when cold and inflated to the pressure recommended by the vehicle manufacturer on the Tire and Loading Information placard on the driver's door B-pillar or the tire pressure label on the inside of the fuel filler flap. If your vehicle has tires of a different size than the size indicated on the Tire and Loading Information placard or the tire pressure label, you should determine the proper tire pressure for those tires. As an added safety feature, your vehicle has been equipped with a tire pressure monitoring system (TPMS) that illuminates a low tire pressure telltale when one or more of your tires are significantly underinflated. Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure. Driving on a significantly underinflated tire causes the tire to overheat and can lead to tire failure. Underinflation also reduces fuel efficiency and tire tread life, and may affect the vehicle's handling and stopping ability. Please note that the TPMS is not a substitute for proper tire maintenance, and it is the driver's responsibility to maintain correct tire pressure, even if underinflation has not reached the level to trigger illumination of the TPMS low tire pressure telltale. USA only: Your vehicle has also been equipped with a TPMS malfunction indicator to indicate when the system is not operating properly. The TPMS malfunction indicator is combined with the low tire pressure telltale. When the system detects a malfunction, the telltale will flash for approximately one minute and then

Tire pressure 323

remain continuously illuminated. This sequence will be repeated every time the vehicle is started as long as the malfunction exists. When the malfunction indicator is illuminated, the system may not be able to detect or signal low tire pressure as intended. TPMS malfunctions may occur for a variety of reasons, including the installation of incompatible replacement or alternate tires or wheels on the vehicle that prevent the TPMS from functioning properly. Always check the TPMS malfunction telltale after replacing one or more tires or wheels on your vehicle to ensure that the replacement or alternate tires and wheels allow the TPMS to continue to function properly.

i USA only:

If the tire pressure monitor is malfunctioning, it may take more than 10 minutes for the tire pressure warning lamp to inform you of the malfunction by flashing for 60 seconds and then remaining lit. When the malfunction has been rectified, the tire pressure warning lamp goes out after driving for a few minutes.

Information on tire pressures is displayed in the multifunction display. After a few minutes of driving, the current tire pressure of each tire is shown in the multifunction display. i The tire pressure values indicated by the on-board computer may differ from those measured at a gas station with a pressure gauge. The tire pressures shown by the on- board computer refer to those measured at sea level. At high altitudes, the tire pressure values indicated by a pressure gauge are higher than those shown by the on-board computer. In this case, do not reduce the tire pressures.

i The operation of the tire pressure monitor can be affected by interference from radio transmitting equipment (e.g. radio

324 Tire pressure

headphones, two-way radios) that may be being operated in or near the vehicle.

i USA only:

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification to this device could void the user’s authority to operate the equipment.

i Canada only:

This device complies with the RSS-210 of Industry Canada. Operation is subject to the following two conditions: 1. This device may not cause harmful interference, and 2. this device must accept any interference received, including interference that may cause undesired operation. Any unauthorized modification to this device could void the user’s authority to operate the equipment.

Checking tire pressure electronically X Make sure that the SmartKey is in position

2 (Y page 132) in the ignition lock. X Press the = or ; button on the steering wheel to select the Serv. menu. X Press the 9 or : button to select Tire Pressure. X Press the a button.

The current tire pressure for each wheel will be displayed in the multifunction display. If the vehicle has been parked for longer than 20 minutes, the Tire pressures will be displayed after driving a few minutes message appears in the display. After a teach-in period, the tire pressure monitor automatically recognizes new wheels

or new sensors. If a clear allocation of the tire pressure values to the individual wheels is not possible, the Tire Pressure Monitor Active message is shown instead of the tire pressure display. The tire pressures are already being monitored. i If a spare wheel/emergency spare wheel

is mounted, the system may continue to show the tire pressure of the wheel that has been removed for a few minutes. If this occurs, note that the value displayed for the position where the spare tire is mounted is not the same as the spare wheel/emergency spare wheel's current tire pressure.

Tire pressure monitor warning messages If the tire pressure monitor detects a significant pressure loss on one or more tires, a warning message is shown in the multifunction display. A warning tone also sounds and the tire pressure warning lamp lights up in the instrument cluster. Each tire that is affected by a significant loss of pressure is highlighted with a color. If the Correct Tire Pressure message appears in the multifunction display: X Check the tire pressure on all four wheels

and correct it if necessary.

i If the wheel positions on the vehicle are interchanged, the tire pressures may be displayed for the wrong positions for a short time. This is rectified after a few minutes of driving, and the tire pressures are displayed for the correct positions.

Restarting the tire pressure monitor G WARNING It is the driver's responsibility to set the tire pressure to the recommended cold tire pressure. Underinflated tires affect the ability to steer or brake the vehicle. You might lose control over the vehicle.

When you restart the tire pressure monitor, all existing warning messages are deleted and the warning lamps go out. The monitor uses the currently set tire pressures as the reference values for monitoring. The tire pressure monitor must be restarted when you set the tire pressure to a new value (as a result of changed drive or load characteristics, for example). The tire pressure monitor then monitors the new tire pressure values. i Canada only: in most cases, the tire pressure monitor recognizes the new reference values automatically. However, you can also define reference values manually as described here.

Restart the tire pressure monitor after you have set the tire pressure to the value recommended for the desired driving situation (Y page 317). Only correct tire pressures on cold tires. Comply with the recommended tire pressures on the Tire and Loading Information placard on the B-pillar on the driver's side. Additional tire pressure values for driving at high speeds or with heavy loads can be found in the tire pressure table on the inside of the fuel filler flap. X Make sure that the tire pressure is correct

on all four wheels.

X Make sure that the SmartKey is in position

2 in the ignition lock. X Press the = or ; button on the steering wheel to select the Serv. menu. X Press the 9 or : button to select Tire Pressure. X Press the a button.

The multifunction display shows the current tire pressure of the individual tires or the Tire pressures will be displayed after driving a few minutes message. X Press the : button. The Use Current Pressures as New Reference Values message appears in the multifunction display.

Loading the vehicle 325

If you wish to confirm the restart: X Press the a button. The Tire Press. Monitor Restarted message appears in the multifunction display. After driving for a few minutes, the system checks whether the current tire pressures are within the specified range. The new tire pressures are then accepted as reference values and monitored.

If you wish to cancel the restart: X Press the % button.

The tire pressure values stored at the last restart will continue to be monitored.

Loading the vehicle Instruction labels for tires and loads G WARNING Do not overload the tires by exceeding the specified load limit as indicated on the Tire and Loading Information placard on the driver's door B-pillar. Overloading the tires can overheat them, possibly causing a blowout. Overloading the tires can also result in handling or steering problems, or brake failure.

Two instruction labels on your vehicle show the maximum possible load. (1) The Tire and Loading Information placard

on the B-pillar on the driver's side. The Tire and Loading Information placard shows the maximum permissible number of occupants and the maximum permissible vehicle load. It also contains details of the tire sizes and corresponding pressures for tires mounted at the factory.

(2) The vehicle identification plate is on the B-pillar on the driver's side. The vehicle identification plate informs you of the gross vehicle weight rating. It is made up of the vehicle weight, all vehicle

326 Loading the vehicle

occupants, the fuel and the cargo. You can also find information about the maximum gross axle weight rating on the front and rear axle. The maximum gross axle weight rating is the maximum weight that can be carried by one axle (front or rear axle). Never exceed the maximum load or the maximum gross axle weight rating for the front or rear axle.

X The Tire and Loading Information placard gives you details on maximum permissible gross vehicle weight rating :: "The gross weight of occupants and luggage must never exceed XXX kilograms or XXX pounds."

The gross weight of all vehicle occupants, cargo, luggage and trailer load/noseweight (if applicable) must not exceed the specified value.

: B-pillar, driver's side

Maximum permissible gross vehicle weight rating i The specifications shown on the Tire and

Loading Information placard in the illustration are examples. The maximum permissible gross vehicle weight rating is vehicle-specific and may differ from that in the illustration. You can find the valid maximum permissible gross vehicle weight rating for your vehicle on the Tire and Loading Information placard.

Number of seats i The specifications shown on the Tire and

Loading Information placard in the illustration are examples. The number of seats is vehicle-specific and can differ from the details shown. The number of seats in your vehicle can be found on the Tire and Loading Information placard.

Maximum number of seats : determines the maximum number of occupants allowed to travel in the vehicle. This information can be found on the Tire and Loading Information placard.

Steps for determining the correct load limit Step-by-step instructions The following steps have been developed as required of all manufacturers under Title 49, Code of U.S. Federal Regulations, Part 575

pursuant to the "National Traffic and Motor Vehicle Safety Act of 1966". X Step 1: Locate the statement "The

combined weight of occupants and cargo should never exceed XXX kg or XXX lbs." on your vehicle's Tire and Loading Information placard.

X Step 2: Determine the combined weight of the driver and passengers that will be riding in your vehicle.

X Step 3: Subtract the combined weight of

the driver and passengers from XXX kilograms or XXX lbs.

X Step 4: The resulting figure equals the

available amount of cargo and luggage load capacity. For example, if the "XXX" amount equals 1400 lbs and there will be five 150 lbs passengers in your vehicle, the amount of available cargo and luggage load capacity is 650 lbs (1400 - 750 (5 x 150) = 650 lbs).

X Step 5: Determine the combined weight of

luggage and cargo being loaded on the vehicle. That weight may not safely exceed the available cargo and luggage load capacity calculated in step 4.

X Step 6 (if applicable): If your vehicle will be towing a trailer, load from your trailer will be transferred to your vehicle. Consult this manual to determine how this reduces the available cargo and luggage load capacity of your vehicle (Y page 329).

Loading the vehicle 327

328 Loading the vehicle

Example: step 1 to 3
The following table shows examples on how to calculate total and cargo load capacities with varying seating configurations and number and size of occupants. The following examples use a cargo limit of 1500 lbs (680 kg). This is for illustration purposes only. Make sure you are using the actual load limit for your vehicle stated on the vehicle's Tire and Loading Information placard (Y page 326).

Step 1

Step 2

Combined maximum weight of occupants and cargo (data from the Tire and Loading Information placard)

Number of people in the vehicle (driver and occupants) Distribution of the occupants Weight of the occupants

Gross weight of all occupants

Example 1
1500 lbs (680 kg)

Example 2
1500 lbs (680 kg)

Example 3
1500 lbs (680 kg)

Example 1

Example 2

Example 3

Front: 1

Occupant 1: 150 lbs (68 kg)

Front: 1
Rear: 2
Occupant 1: 200 lbs (91 kg) Occupant 2: 190 lbs (86 kg) Occupant 3: 150 lbs (68 kg)

Front: 2
Rear: 3
Occupant 1: 150 lbs (68 kg) Occupant 2: 180 lbs (82 kg) Occupant 3: 160 lbs (73 kg) Occupant 4: 140 lbs (63 kg) Occupant 5: 120 lbs (54 kg) 750 lbs (340 kg) 540 lbs (245 kg) 150 lbs (68 kg)

Maximum load rating 329

Example 1
1500 lbs (680 kg) - 750 lbs (340 kg) = 750 lbs (340 kg)

Example 2
1500 lbs (680 kg) - 540 lbs (245 kg) = 960 lbs (435 kg)

Example 3
1500 lbs (680 kg) - 150 lbs (68 kg) = 1350 lbs (612 kg)

Step 3

Permissible cargo and trailer load/ noseweight (maximum gross vehicle weight rating from the Tire and Loading Information placard minus the gross weight of all occupants)

The higher the weight of all the occupants, the smaller the maximum load for luggage. Further information can be found under "Towing a trailer" (Y page 329).

Vehicle identification plate Even if you have calculated the total load carefully, you should still make sure that the gross vehicle weight rating and the gross axle weight rating are not exceeded. Details can be found on the vehicle identification plate on the B-pillar on the driver's side of the vehicle (Y page 325). Gross vehicle weight: the gross weight of the vehicle, all passengers, cargo and trailer load/noseweight (if applicable) must not exceed the permissible gross vehicle weight. Gross axle weight rating: the maximum permissible load that can be carried by one axle (front or rear axle). To ensure that your vehicle does not exceed the maximum permissible values (gross vehicle weight and maximum gross axle weight rating), have your loaded vehicle (including driver, occupants, cargo, and full trailer load if applicable) weighed on a suitable vehicle weighbridge.

Trailer load/noseweight The trailer load/noseweight affects the gross weight of the vehicle. If a trailer is attached, the trailer load/noseweight is included in the load along with occupants and luggage. The

trailer load/noseweight is usually approximately 10% of the gross weight of the trailer and its load. Your Mercedes-Benz has been designed primarily to carry passengers and their luggage. Mercedes-Benz does not recommend towing a trailer with your vehicle.

Maximum load rating

G WARNING Do not overload the tires by exceeding the specified load limit as indicated on the Tire and Loading Information placard on the driver's door B-pillar. Overloading the tires can overheat them, possibly causing a blowout. Overloading the tires can also result in handling or steering problems, or brake failure.

330 Uniform Tire Quality Grading Standards

North America have these grades branded on the sidewall. i The actual values for tires are vehicle-

specific and may deviate from the values in the illustration.

i The actual values for tires are specific to

each vehicle and may deviate from the values in the illustration.

Maximum tire load : is the maximum permitted weight for which the tire is approved. Further information on tire loads (Y page 331).

Uniform Tire Quality Grading Standards Overview of Tire Quality Grading Standards

The Uniform Tire Quality Grading is a U.S. Government requirement. Their purpose is to provide drivers with consistent and reliable information regarding tire performance. Tire manufacturers are required to grade tires using three performance factors: tread wear :, tire traction ;, and temperature resistance =. Although not a Government of Canada requirement, all tires made for sale in

Where applicable, the tire grading information can be found on the tire sidewall between the tread shoulder and maximum tire width. For example: Tread wear Traction 200

Temperature

AA

All passenger car tires must conform to the statutory safety requirements in addition to these grades.

Tread wear The tread wear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified U.S. government course. For example, a tire graded 150 would wear one and one-half times as well on the government course as a tire graded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm, due to variations in driving habits, service practices and differences in road characteristics and climate conditions.

Traction G WARNING The traction grade assigned to this tire is based on straight-ahead braking traction tests, and does not include acceleration, cornering, hydroplaning, or peak traction characteristics.

The traction grades, from highest to lowest, are AA, A, B, and C. Those grades represent

the tire's ability to stop on a wet surface as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tire marked C may have poor traction performance. G WARNING If ice has formed on the road, tire traction will be substantially reduced. Under such weather conditions, drive, steer and brake with extreme caution.

The safe speed on a wet, snow covered or icy road is always lower than on dry road surfaces. You should pay special attention to road conditions when temperatures are around the freezing point. Mercedes-Benz recommends a minimum tire tread depth of 1/6 in (4 mm) for all four winter tires (Y page 316) to maintain normal driving characteristics in winter. Winter tires can reduce the braking distance on snow covered surfaces in comparison to summer tires. Stopping distance, however, is still considerably greater than when the road is not covered with ice or snow. Take appropriate care when driving. ! Avoid wheelspin. This can lead to damage

to the drive train.

Temperature G WARNING The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause excessive heat build-up and possible tire failure.

The temperature grades are A (the highest), B, and C. These represent the tire's resistance to the generation of heat and its ability to dissipate heat when tested under

Tire labeling 331

controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law.

Tire labeling Tire labeling overview The following markings are on the tire in addition to the tire name (sales designation) and the manufacturer's name:

: Uniform Tire Quality Grading Standard

; DOT, Tire Identification Number

(Y page 335)

(Y page 334)

= Maximum tire load (Y page 329) ? Maximum tire pressure (Y page 320) A Manufacturer B Tire material (Y page 335) C Tire size designation, load-bearing

capacity and speed index (Y page 332)

332 Tire labeling

D Load index (Y page 334) E Tire name i Tire data is vehicle-specific and may deviate from the data in the example.

Tire size designation, load-bearing capacity and speed index

: Tire width ; Nominal aspect ratio in % = Tire code ? Rim diameter A Load bearing index B Speed index i Tire data is vehicle-specific and may deviate from the data in the example.

General: depending on the manufacturer's standards, the size imprinted in the tire wall may not contain any letters or may contain one letter that precedes the size description. If there is no letter preceding the size description (as shown above): these are passenger vehicle tires according to European manufacturing standards. If "P" precedes the size description: these are passenger vehicle tires according to U.S. manufacturing standards. If "LT" precedes the size description: these are light truck tires according to U.S. manufacturing standards. If "T" precedes the size description: these are compact emergency spare wheels at high tire

pressure, to be used only temporarily in an emergency. Tire width: tire width : shows the nominal tire width in millimeters. Nominal aspect ratio: aspect ratio ; is the size ratio between the tire height and the tire width and is shown in percent. The aspect ratio is calculated by dividing the tire width by the tire height. Tire code: tire code = specifies the tire type. "R" represents radial tires. "D" represents diagonal tires, "B" represents diagonal radial tires. Optionally, tires with a maximum speed of over 149 mph(240 km/h) may have "ZR" in the size description depending on the manufacturer (e.g. 245/40 ZR 18). Rim diameter: rim diameter ? is the diameter of the bead seat, not the diameter of the rim flange. The rim diameter is specified in inches (in). Load bearing index: load bearing index A is a numerical code which specifies the maximum load-bearing capacity of a tire. G WARNING The tire load rating must always be at least half of the GAWR of your vehicle. Otherwise, sudden tire failure may be the result which could cause an accident and/or serious injury to you or others. Always replace rims and tires with rims and tires having the same specifications (designation, manufacturer and type) as shown on the original part. G WARNING Do not overload the tires by exceeding the specified load limit as indicated on the Tire and Loading Information placard on the driver's door B-pillar. Overloading the tires can overheat them, possibly causing a blowout. Overloading the tires can also result in handling or steering problems, or brake failure.

Tire labeling 333

Example: The load bearing index 91 is equivalent to a maximum load of 1356 lbs (615 kg) that the tire can carry. For further information on the maximum tire load in kilograms and pounds, see (Y page 329). For further information on the load bearing index, see Load index (Y page 334). Speed index: speed index B specifies the approved maximum speed of the tire. G WARNING Even when permitted by law, never operate a vehicle at speeds greater than the maximum speed rating of the tires. Exceeding the maximum speed for which tires are rated can lead to sudden tire failure, causing loss of vehicle control and possibly resulting in an accident and/or serious personal injury and possible death, for you and for others.

Regardless of the speed index always observe the speed limits. Drive carefully and adapt your driving style to the traffic conditions. Summer tires Index ZR...Y ZR...(..Y) ZR

Speed rating Up to 100 mph (160 km/h) Up to 106 mph (170 km/h) Up to 112 mph (180 km/h) Up to 118 mph (190 km/h) Up to 130 mph (210 km/h) Up to 149 mph (240 km/h) Up to 168 mph (270 km/h) Up to 186 mph (300 km/h) Up to 186 mph (300 km/h) above 186 mph (300 km/h) above 149 mph (240 km/h)

25 or M+Si for winter tires.

ROptionally, tires with a maximum speed of over 149 mph (240 km/h) may have "ZR" in the size description depending on the manufacturer (e.g. 245/40 ZR 18). The service specifications consist of load bearing index A and speed index B.

RIf the size description of your tire includes

"ZR" and there are no service specifications, ask the tire manufacturer in order to find out the maximum speed. If a service specification is available, the maximum speed is limited according to the speed index in the service specification. Example: 245/40 ZR 18 97 Y. In this example, "97 Y" is the service specification. The letter "Y" represents the speed index and the maximum speed of the tire is limited to 186 mph (300 km/h).

REvery tire that has a maximum speed above 186 mph (300 km/h) must have "ZR" in the size description and the service specification must be given in brackets. Example: 275/40 ZR 18 (99 Y). The speed index "(Y)" shows that the maximum speed of the tire is above 186 mph (300 km/h). Ask the tire manufacturer to find out the maximum speed. All-weather tires and winter tires Index Q M+S25 Up to 100 mph (160 km/h) T M+S25 Up to 118 mph (190 km/h) H M+S25 Up to 130 mph (210 km/h) V M+S25 Up to 149 mph (240 km/h)

Speed rating

i Not all tires that have the M+S

identification offer the driving characteristics of winter tires. Winter tires have, in addition to the M+S identification, the i snow flake symbol on the tire sidewall. Tires with this identification fulfill the requirements of the Rubber

334 Tire labeling

Manufacturers Association (RMA) and the Rubber Association of Canada (RAC) regarding the tire traction on snow and have been especially developed for driving on snow.

An electronic speed limiter prevents your vehicle from exceeding the following speeds: RAll vehicles (except AMG vehicles):

130 mph (210 km/h)

RAMG vehicles: 155 mph (250 km/h) RAMG vehicles with Performance Package:

186 mph (300 km/h)

The speed index of tires mounted at the factory may be higher than the maximum speed that the electronic speed limiter permits. Make sure that your tires have the required speed index as specified in the "tires" section (Y page 339), e.g. if you buy new tires. More information on reading the tire data can be obtained at any qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center.

Load index

i Tire data is vehicle-specific and may deviate from the data in the example.

In addition to the load bearing index, load index : may be imprinted after the letters that identify speed index B (Y page 332) on the sidewall of the tire.

RIf no specification is given: no text (as in the

example above), represents a standard load (SL) tire

RXL or Extra Load: represents a reinforced

tire

RLight load: represents a light load tire RC, D, E: represents a load range that

depends on the maximum load that the tire can carry at a certain pressure

DOT, Tire Identification Number (TIN) U.S. tire regulations prescribe that every manufacturer of new tires or retreader has to imprint a TIN in or on the sidewall of each tire produced.

The TIN is a unique identification number. The TIN enables the tire manufacturers to inform purchasers of recalls and other safety- relevant matters. It makes it possible for the purchaser to easily identify the affected tires. The TIN is made up of manufacturer identification code ;, tire size =, tire type code ? and manufacturing date A. i Tire data is vehicle-specific and may deviate from the data in the example.

DOT (Department of Transportation): tire symbol : indicates that the tire complies with the requirements of the U.S. Department of Transportation. Manufacturer identification code: manufacturer identification code ; provides details on the tire manufacturer. New tires

Definition of terms for tires and loading 335

have a code with two symbols. Retreaded tires have a code with four symbols. Further information about retreaded tires (Y page 314). Tire size: identifier = describes the tire size. Tire type code: tire type code ? can be used by the manufacturer as a code to describe specific characteristics of the tire. Date of manufacture: date of manufacture A provides information about the age of a tire. The first and second positions represent the week of manufacture, starting with "01" for the first calendar week. Positions three and four represent the year of manufacture. For example, a tire that is marked with "3208", was manufactured in week 32 in 2008.

Tire characteristics

i Tire data is vehicle-specific and may deviate from the data in the example.

This information describes the tire cord and the number of layers in sidewall : and under the tread ;.

Definition of terms for tires and loading Tire ply composition and material used Describes the number of plies or the number of layers of rubber-coated fabric in the tire

tread and sidewall. These are made of steel, nylon, polyester and other materials.

Bar Metric unit for tire pressure. There are 14.5038 pounds per square inch (psi) to 1 bar; there are 100 kilopascals (kPa) to 1 bar.

DOT (Department of Transportation) DOT marked tires fulfill the requirements of the United States Department of Transportation.

Normal occupant weight The number of occupants the vehicle is designed to seat, multiplied by 68 kilograms (150 lbs).

Uniform Tire Quality Grading Standards A uniform standard to grade the quality of tires with regards to tread quality, tire traction and temperature characteristics. Ratings are determined by tire manufacturers using U.S. government testing procedures. The ratings are molded into the sidewall of the tire.

Recommended tire pressure The recommended tire pressure for your vehicle under normal driving conditions. You will find the recommendation on the Tire and Loading Information placard on the B-pillar on the driver's side of your vehicle. The recommended tire pressure provides the best balance between handling characteristics, ride comfort and wear. Supplemental information pertaining to special driving situations can be found on the tire inflation