ABS warning lamp

Fig 1: Identifying ABS Warning Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Identifying Circuit Diagram - ABS Warning Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The ABS or TC/ABS control module monitors the function of the ABS system and if a fault arises, it will turn on the ABS warning lamp situated in the right-hand section of the main instrument unit.

When the ABS lamp lights up, the anti-lock braking system is disabled and the brakes work just like a conventional braking system.

In cars with ABS (not bus systems),  the lamp is powered by the main instrument unit and is grounded via the main instrument unit connection 10 (K20) in the TC/ABS control module.

In cars with TC/ABS (bus systems),  the main instrument unit receives information on the bus to turn on/off the lamp.

Fig 3: Identifying Communication Diagram - ABS Warning Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 4: Identifying Communication Circuit Diagram - ABS Warning Lamp

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The TC/ABS control module turns on the lamp when the ignition is turned on and it will go out after about 3 seconds provided no faults are detected.

The brake fluid level warning lamp and the central warning lamp will come on once the ABS warning lamp has come on.