Anti-Lock Brake Indicator: Operation

When the ignition key is turned to the ON position, the Amber ABS warning indicator light is lit until the Controller Anti-Lock Brakes (CAB) completes its self-tests and turns off the indicator light (approximately 4 seconds). The Amber ABS warning indicator light will illuminate when the CAB detects a condition that results in the shut down of ABS function or when the instrument cluster does not receive messages from the CAB. The CAB sends a message across the PCI bus circuit that informs the instrument cluster to turn on the Amber ABS warning indicator light.

Under most conditions, when the Amber ABS warning indicator light is on, only the ABS function of the brake system is affected; the base brake system and the ability to stop the vehicle are not affected.