Level Control System Indicator Lamps

Level Control System Indicator Lamps

Warning Lamps









ABS Warning Lamp

• If the ABS warning lamp - 3 - does not go out after the ignition is turned on and the test sequence is complete, it could be caused by the following errors:





a Voltage supply is below 10 volts
b There is a malfunction in the ABS

The ABS system remains switched off during an ABS malfunction - b -, but the traditional brake system remains fully functional.

c Since the last time the vehicle was started there was a temporary speed sensor malfunction.

In this case the ABS warning lamp will go out after the engine is restarted and the vehicle speed exceeds 2.75 km/h.

d The connection from instrument cluster to ABS control module (w/Electronic Differential Lock (EDL)) (J104) is interrupted.
e ABS warning lamp is faulty.

ABS Warning Lamp and Brake System Warning Lamp





• If the ABS warning lamp - 3 - goes out but the brake system warning lamp - 4 - lights up, the malfunctions causes may be:

a The brake fluid level is too low.

Three warning tones will sound after turning on the ignition.

b There is a malfunction in the wiring to brake system warning lamp.

• If the ABS warning lamp - 3 - and the brake system warning lamp - 4 - both light up, the ABS system is faulty. A change in braking behavior should be checked.

CAUTION!
After the ABS warning lamp and brake system warning lamp light up, the rear wheels may lock prematurely when braking.

ASR/ESP Control Lamp





• If the ASR/ESP control lamp - 1 - does not turn off after the ignition is turned on and the test sequence is completed, the malfunction may be:

There is a malfunction present which only affects the ASR/ESP. The ABS/EDL and Electronic Brake pressure Distribution (EBD) safety systems are still completely functional => check the Diagnostic Trouble Code (DTC) memory.

a Short circuit to B+ in ASR/ESP button (E256).
b A short circuit to ground in ASR/ESP control lamp activation.
c The connection from the instrument cluster to contact 31 of ABS control module (w/EDL) (J104) is interrupted.
d The ASR/ESP system has been turned off by the ASR/ESP button.

If the ASR/ESP Control Lamp blinks while driving, the ASR or ESP system is in regulating mode.

• If the ASR/ESP control lamp - 1 - did not light up during the self test, the following malfunction is present:





a ASR/ESP control lamp is faulty => perform a electrical test

ABS warning lamp and ASR/ESP control lamp

• If the ABS warning lamp - 3 - and the ASR/ESP control lamp - 1 - do not turn off after the ignition is turned on and the test sequence is completed, the malfunction may be:

a The voltage supply for the ABS system is below 10 volts and the vehicle speed is less than 12 km/h => Perform a electrical test.
b A short circuit to positive in the ASR/ESP control lamp activation.
Short circuit to B+ in ASR/ESP button.

ABS Warning Lamp, Brake System Warning Lamp and ASR/ESP Control Lamp





• If the ABS warning lamp - 3 -, ASR/ESP control lamp, - 1 - and brake system warning lamp - 4 - do not go out, malfunction causes may be:

a The voltage supply for the ABS system is below 10 volts and the vehicle speed is less than 12 km/h => Perform a electrical test.
b There is a malfunction in the hydraulic control unit; the ABS is not working.

A change in braking behavior should be checked. The rear wheels can lockup early when braking!

c There was a dynamic wheel speed sensor malfunction during the last driving period.

In this case, the warning lamps automatically switch off after a new vehicle start once a speed of 2.75 km/h is exceeded. This requires that the malfunction does not occur again after the repair work and new test are performed.

Brake System Warning Lamp





• If the brake system warning lamp - 4 - does not go out after turning the ignition on, the malfunction may be:

a Foot operated parking brake is engaged.
The switch for the brake system warning lamp is faulty or incorrectly adjusted.
There is a malfunction in the wire routing => Perform a electrical test.

The parking brake switch also informs the ABS control module (w/EDL) whether the parking brake is set or not. When the parking brake pedal is set, the ESP control is negatively influenced.

Brake Pad Wear Indicator Lamp





• If the brake pad wear indicator lamp - 2 - does not switch off 3 seconds after the ignition is turned on or if it lights up when the vehicle is driven, it could be caused by the following malfunctions:

a The brake pads are worn.

Check front and rear brake pads/linings. Replace worn brake pads/linings.

b There is a malfunction in the wire routing.