Volkswagen Workshop Service and Repair Manuals > Passat (B3) > Running gear self-diagnosis | Self diagnosis, V.A.G Inspection Service

Running gear self-diagnosis

Faults displayed by warning lamps

◆ If the ABS warning lamp (K47) -2- does not go out after switching on ignition and completion of test sequence then the fault may be:

-a- Voltage supply is below 10 Volt
-b- There is a fault in the ABS
-c- There has been a sensor fault after last startíng the vehicle (sporadic).
-d- Open circuit between pin 1 of ABS warning lamp module and control unit pin 16.
-e- The ABS warning lamp module is defective
With an ABS fault the anti-locking brake system remains switched off, but the conventional braking system remains fully functional. In the case of sensor fault -c- the ABS warning lamp will extinguish after restarting the engine and 20 km/h (approx. 13 mph) is exceeded.

◆ If the ABS warning lamp goes out but the brake system warning lamp (K118) -1- remains on then the fault may be:

-a- The handbrake is pulled on
-b- The brake fluid level is too low
-c- There is a fault in the control of the brake system warning lamp (K118) => Current flow diagram.

◆ If both the ABS warning lamp -2- and the brake system warning lamp -1- do not go out then the ABS and EBPD (electronic brake pressure distribution) is non-functional. In this case a braking behaviour change is to be reckoned with as the brake pressure to the rear wheels will not be regulated.

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