Warning Lamps

ABS/EDL/ASR Bosch 5.3, indication of malfunctions via warning lamps








Warning lamps (previous instrument cluster)








Warning lamps

In the new instrument cluster, the function of the brake and parking brake warning light -K7- has been transferred to the warning light for brake system -K118-.





ABS warning light -K47
^ If the ABS warning light -K47- (item no. 3) does not go out after the ignition is switched on and the test sequence is complete, it could be caused by the following errors:

-a- voltage supply is under 10 volts.

-b- there is a malfunction in the hydraulic control module; ABS system is therefore not operating.

Account for differences in braking behavior. When the ABS warning lamp is lit up, the rear wheels may lock prematurely during braking!

-c- there was a periodic wheel speed sensor malfunction since the last vehicle start.

If this is the case, the ABS warning lamp will go out automatically after vehicle is started again and a speed of 2.75 km/h has been exceeded.

-d- there is an open circuit in the connection from instrument cluster to ABS control module (w/EDL)-J104-.
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-e- ABS warning light is faulty





ABS warning light -K47- and warning light for brake system -K118
^ If the ABS warning light -K47- (item no. 3) does switch off, but the warning light for brake system -K118- remains lit, the malfunction causes could include:

-a- brake fluid level is too low
After switching ignition on, three warning signals are audible.

-b- there is a malfunction in the wire routing to the warning light for brake system -K118-
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^ If the ABS warning light -K47- (item no. 3) and the warning light for brake system -K118- (item no. 4) light up, the ABS system is faulty. Account for differences in braking behavior.

WARNING: When the ABS warning light -K47- and the warning light for brake system -K118- are lit, the rear wheels can lock early during braking.





Traction control indicator light -K86-
^ If the traction control indicator light -K86- (item no. 1 ) does not go out after the ignition is switched on and the test sequence is complete, it could be caused by the following errors:

There is a malfunction that only affects the ASR system. The ABS/EDL and EBD safety systems are still completely functional.

-a- short circuit to B+ in the ASR button.
The traction control indicator light switches off five minutes after ignition is switched on.





-b- there is a short circuit to Ground (GND) for activation of the ASR warning lamp.
If this is the case, check the wire from terminal 20 of ABS control module -J104- to the instrument cluster.

-c- the ABS control module -J104- was coded incorrectly following a malfunction and the subsequent replacement of the hydraulic control unit.

DTC memory should be checked first in this case,Refer to Check DTC Memory (Function 02). After this, code the ABS control module (w/EDL) -J104- again,Refer to Code Control Module (Function 07).

^ If the traction control indicator light -K86- (item no 1 ) did not light up during the self-test, the following malfunction is present:








^ -a- the traction control indicator is faulty, Refer to ABS/Edl/ASR Bosch 5.3, Electrical Testing - carry out "Electrical test", test step 12.

ABS warning light -K47-, traction control indicator light -K86- and warning light for brake system -K118-





^ If the ABS warning light -K47- (item no. 3), the traction control indicator light -K86- (item no. 1), and the warning light for brake system -K118- (item no. 4) do not switch off, the malfunction causes could include:

-a- the voltage supply for the ABS system is below 10 volts and the vehicle speed is less than 12 km/hm, Refer to ABS/Edl/ASR Bosch 5.3, Electrical Testing - Carry out "Electrical test", test step 1.

-b- there is a malfunction in the hydraulic control module; ABS system is therefore not operating.
Account for differences in braking behavior. The rear wheels may lock too early during 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. The prerequisite for this is that the malfunction does not occur again after the repair work and new test are performed.





^ If the ABS warning light -K47- (item no. 3) and the traction control indicator light -K86- (item no. 1 ) light up after ignition is switched on and self test is completed (test sequence). The malfunction causes could include:
Account for differences in braking behavior. When the ABS warning lamp is lit up, the rear wheels may lock prematurely during braking!

-a- There is an open circuit or short circuit to B+ in the wire that controls the ABS warning lamp -K47-, between terminal 21 of the ABS control module -J104- and the instrument cluster, Refer to ABS/Edl/ASR Bosch 5.3, Electrical Testing, carry out "Electrical test" step 10.





-b- the voltage supply for the ABS system is below 10 volts and the vehicle speed is less than 12 km/h, Refer to ABS/Edl/ASR Bosch 5.3, Electrical Testing, - Carry out "Electrical test", test step 1.

Brake and parking brake warning light -K7

In the new instrument cluster, the function of the brake and parking brake warning light -K7- has been transferred to the warning light for brake system -K118-.





^ If the brake and parking brake warning light -K7- (item no. 5) does not go out after the ignition is switched on, it could be caused by the following errors:

-a- parking brake is engaged.

-b- the switch for the brake and parking brake warning light -K7- is faulty or is incorrectly adjusted.

-c- there is a malfunction in the wire routing - wiring diagram.

Brake pad wear indicator light -K32
This warning lamp is not installed in all vehicles.





^ If the brake pad wear indicator light -K32- (item no. 2) does not switch off 3 seconds after the ignition is switched on or if it lights up when vehicle is driven, it could be caused by the following malfunctions:
-a- brake pads may be worn.
Check the brake pads at front and rear axles. Replace brake pads if worn.
-b- there is a malfunction in the wire routing
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