Level Control System Indicator Lamps
Warning Lamps
| Item | Designation | |
|---|---|---|
| 1 | Anti-Slip Regulation (ASR)/Electronic Stabilization Program (ESP) control lamp -K155- | |
| 2 | Brake pad wear indicator lamp -K32- | |
| 3 | Anti-lock Brake System (ABS) warning lamp -K47- | |
| 4 | Brake system warning lamp -K118- | |
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. Refer to appropriate SYSTEMS WIRING DIAGRAM.
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. Refer to appropriate SYSTEMS WIRING DIAGRAM.
- 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.
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. Refer to appropriate SYSTEMS WIRING DIAGRAM.