Date of printing:

01/23/2022

Online Owner's Manual [In depth | Safety | Driving safety systems]

Owner's Manual version: 06-13

Note: The online Owner's Manual is the latest version available. Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment. Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle.

Driving safety systems

Driving safety systems overview

This section contains information on the following driving safety systems:

  • ABS (Anti-lock Braking System)

  • BAS (Brake Assist System)

  • Adaptive brake lamps

  • ASR (Acceleration Skid Control)

  • ESP® (Electronic Stability Program)

  • EBD (Electronic Brake Force Distribution)

Important safety notes

If you fail to adapt your driving style or if you are inattentive, the driving safety systems can neither reduce the risk of accident nor override the laws of physics. Driving safety systems are merely aids designed to assist driving. You are responsible for the distance to the vehicle in front, for vehicle speed and for braking in good time. Always adapt your driving style to the prevailing road and weather conditions and maintain a sufficient, safe distance from other road users. Drive carefully.

Only with the best possible contact between tyres and the road can the described driving safety systems attain their maximum effectiveness. Therefore pay special attention to the information on tyres, the recommended minimum tyre treads, etc., in the "Wheels and tyres" section more.

Use winter tyres (M+S tyres), with snow chains if necessary, when the conditions are wintry. Only then will the driving safety systems described in this section achieve their maximum effect.

ABS (Anti-lock Braking System)

Important safety notes

Note the section on 'Important safety notes' more.

../../../../global/pictures_mb/symb_achtung.png

WARNING

If ABS is faulty, the wheels could lock when braking. The steerability and braking characteristics may be severely impaired. Additionally, further driving safety systems are deactivated. There is an increased danger of skidding and accidents.

Drive on carefully. Have ABS checked immediately at a qualified specialist workshop.

If ABS is malfunctioning, other systems will also fail, including driving safety systems. Observe the information relating to the mbsymb2_inv_0021.png more warning lamp.

ABS controls the braking pressure so that the wheels do not lock when braking. This maintains the steerability of your vehicle while braking.

The yellow mbsymb2_inv_0021.png warning lamp in the instrument cluster lights up when the ignition is switched on. The lamp goes out when the engine starts running.

Braking

If ABS intervenes when braking, you will feel a pulsating in the brake pedal.

The pulsating brake pedal can be an indication of hazardous road conditions and functions as a reminder to take extra care while driving.

If ABS intervenes: keep the brake pedal firmly depressed until the braking situation has passed.

To make a full brake application: depress the brake pedal with full force.

BAS (Brake Assist System)

Note the section on 'Important safety notes' more.

../../../../global/pictures_mb/symb_achtung.png

WARNING

If BAS is malfunctioning, the braking distance in an emergency braking situation is increased. There is a risk of accident.

In an emergency braking situation, depress the brake pedal with full force. ABS prevents the wheels from locking.

Vehicles without steering wheel buttons: if the BAS driving safety system is malfunctioning, the mbsymb1a_inv_003a.png warning lamp lights up while the engine is running more.

Brake Assist operates in emergency braking situations. If you depress the brake quickly, BAS automatically increases the brake pressure, thereby reducing the stopping distance.

When you release the brake pedal, the brakes function as usual again. BAS is deactivated.

EBD (electronic brake force distribution)

Note the section on 'Important safety notes' more.

../../../../global/pictures_mb/symb_achtung.png

WARNING

If EBD has malfunctioned, the rear wheels can still lock, e.g. under full braking. This increases the risk of skidding and an accident.

You should therefore adapt your driving style to the different handling characteristics. Have the brake system checked at a qualified specialist workshop.

EBD monitors and controls the brake pressure to the rear wheels. This enables EBD to improve handling during braking.

Observe the information on warning and indicator lamps more.

Adaptive brake lamps

The brake lamps flash rapidly if the vehicle is braked suddenly from a speed of more than 50 km/h or if BAS intervenes during braking. This gives following vehicles a highly visible warning.

If you brake the vehicle from 70 km/h and higher to a standstill, the hazard warning lamps will automatically switch on when the vehicle is stationary. The brake lamps light up again constantly when you depress the brake pedal. The hazard warning lamps switch off automatically once you drive faster than 10 km/h. You can also switch off the hazard warning lamps with the hazard warning lamp button more.

ESP® (Electronic Stability Program)

Important safety notes

Note the section on 'Important safety notes' more.

../../../../global/pictures_mb/symb_achtung.png

WARNING

If ESP® is malfunctioning it will not provide any vehicle stabilisation. There is an increased risk of skidding or of an accident.

Exercise caution when continuing to drive. Have ESP® checked at a qualified specialist workshop.

../../../../global/pictures_mb/symb_ruf.png

Only operate the vehicle briefly (maximum of 10 seconds) on a brake dynamometer. The key must be turned to position 1 in the ignition lock during this time. You could otherwise damage the drivetrain or the brake system.

../../../../global/pictures_mb/symb_ruf.png

Do not operate the vehicle on a roller dynamometer (e.g. for performance testing). If you have to operate the vehicle on a roller dynamometer, please consult a specialist workshop beforehand. You could otherwise damage the drivetrain or the brake system.

If you activate or deactivate ESP® in a vehicle with engageable all-wheel drive, ESP® will be deactivated for the duration of the activation/deactivation process.

If ESP® is malfunctioning, the mbsymb4_inv_0068.png indicator lamp lights up while the engine is running and the engine power may be reduced more.

ESP® monitors driving stability and detects understeering or oversteering (skidding) in good time. If ESP® detects that the vehicle is deviating from the direction desired by the driver, one or more wheels are braked to stabilise the vehicle. The engine output is also modified to keep the vehicle on the desired course within physical limits. ESP® greatly assists you when driving on wet or slippery road surfaces. ESP® also stabilises the vehicle when braking.

The mbsymb5_inv_0064.png warning lamp in the instrument cluster flashes when ESP® is intervening.

If ESP® intervenes:

Do not deactivate ASR under any circumstances.

When pulling away, only depress the accelerator pedal as far as required

Adapt your driving style to suit the prevailing road and weather conditions.

../../../../global/pictures_mb/symb_info.png

Use only wheels with the recommended tyre sizes. Only then will ESP® function properly.

4ETS (Electronic Traction System)

Note the section on 'Important safety notes' more.

../../../../global/pictures_mb/symb_ruf.png

A function or performance test should only be carried out on a twin-axle dynamometer. Before you operate the vehicle on such a dynamometer, please consult a qualified workshop. You could otherwise damage the drive train or the brake system.

Vehicles with all-wheel drive are equipped with 4ETS. Traction control is part of ESP®.

Should the drive wheels spin, traction control brakes them individually. This allows you to pull away or accelerate even on slippery surfaces, for example when the road is slippery on one side. In addition, greater drive torque is transmitted to the wheel or wheels with traction.

../../../../global/pictures_mb/symb_info.png

Press the accelerator pedal down further than necessary, despite the flashing mbsymb5_inv_0064.png warning lamp, but only when travelling slowly. This gives optimal traction in the lower speed range.

../../../../global/pictures_mb/symb_info.png

Heavy braking reduces the performance of 4ETS. The mbsymb5_inv_0064.png warning lamp then flashes slowly.

Observe the information relating to the mbsymb5_inv_0064.png warning lamp more.

Trailer stabilisation

Note the section on 'Important safety notes' more.

../../../../global/pictures_mb/symb_achtung.png

WARNING

If road and weather conditions are poor, trailer stabilisation will not be able to prevent the vehicle/trailer combination from swerving. Trailers with a high centre of gravity can tip over before ESP® can detect this. There is a risk of an accident.

Always adapt your driving style to the prevailing road and weather conditions.

ESP® trailer stabilisation counteracts critical driving situations in good time and thereby provides considerable assistance when driving with a trailer. Trailer stabilisation is part of ESP®.

If the sensor system and evaluation logic detect trailer swinging movements, ESP® trailer stabilisation firstly brakes individual vehicle wheels in a targeted manner. It thus counteracts swinging movements. If the swinging movements do not stop, the vehicle is braked until the vehicle/trailer combination is stabilised. If necessary, the vehicle's engine output is limited.

If your vehicle with trailer (vehicle/trailer combination) starts to swerve, you will be able to stabilise the vehicle/trailer combination only by braking. ESP® trailer stabilisation helps you to stabilise the vehicle/trailer combination in this situation.

ESP® trailer stabilisation is activated at speeds of over approximately 65 km/h.

If ESP® is deactivated because of a malfunction, the trailer stabilisation system will not function.

ASR (acceleration skid control)

General notes

Important safety notes

Note the section on 'Important safety notes' more.

ASR can neither reduce the risk of an accident nor suspend the laws of physics if the driver does not pay attention when pulling away or accelerating. ASR is only an aid. Always adapt your driving style to suit the prevailing road and weather conditions.

Vehicles without steering wheel buttons: if ASR is malfunctioning, the mbsymb1a_inv_003a.png indicator lamp lights up while the engine is running and the engine power may be reduced more.

ASR improves traction, i.e. the transfer of power from the tyres to the road surface, for a sustained period and, thereby, also improves the driving stability of the vehicle. If the driving wheels start to spin, ASR brakes individual drive wheels and limits the engine torque. ASR thus significantly assists you when pulling away and accelerating, especially on wet or slippery roads.

If traction on the road surface is not sufficient, even ASR will not allow you to pull away without difficulty. The type of tyres and total weight of the vehicle as well as the gradient of the road also play a crucial role.

If ASR intervenes, the mbsymb5_inv_0064.png warning lamp in the instrument cluster flashes.

Activating/deactivating ASR

../../../../global/pictures_mb/symb_achtung.png

WARNING

If deactivated, ASR will not attempt to stabilise the vehicle during pulling away and acceleration. There is an increased risk of skidding and of an accident.

Only deactivate ASR in the situations described in the following.

../../../../global/pictures_mb/symb_ruf.png

If you deactivate ASR, ESP® will still intervene to stabilise the vehicle. Frequent braking automatically triggered by ESP® can damage the brake system.

For this reason, deactivate ASR only briefly and when absolutely necessary.

images/imgaf01c9989cd59676351f19150b5e5404_1_--_--_JPG72.jpg

When ESP® is intervening and the mbsymb5_inv_0064.png warning lamp in the instrument cluster is flashing, leave ASR on. In this case, only depress the accelerator pedal as far as required when pulling away.

Press button mbsymb1a_inv_00e0.png.

If ASR is deactivated, the mbsymb5_inv_0064.png warning lamp in the instrument cluster lights up.

ASR automatically intervenes if you drive faster than 60 km/h or the vehicle handling becomes unstable.

ASR is automatically activated when the engine is started.

The ECO start/stop function switches the engine off automatically when the vehicle is stopped. When pulling away again, the engine starts automatically. ASR then remains in the previously selected status. Example: if ASR was deactivated before the engine was automatically switched off, ASR will also remain off after the engine is automatically started.

It may be best to deactivate ASR briefly in the following situations:

  • if snow chains are being used

  • in deep snow

  • on sand or gravel

If you deactivate ASR:

  • engine torque is not limited and the drive wheels are able to spin. The spinning wheels will then achieve a cutting effect for better traction.

  • traction control remains active through brake intervention. If a drive wheel attains its tyre traction limit because one side of the road is slippery, for example, that wheel is braked. The traction is then increased in this situation.

  • ESP® still intervenes to stabilise the vehicle. The mbsymb5_inv_0064.png warning lamp in the instrument cluster flashes when ESP® is intervening.

Notes

Date of printing:

01/23/2022

Online Owner's Manual [In depth | Safety | Driving safety systems]

Owner's Manual version: 06-13

Note: The online Owner's Manual is the latest version available. Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment. Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle.