ABS Light: Description and Operation

ABS Indicator
The ABS indicator illuminates when one or more of the the following occurs:
The Electronic Brake Control Module (EBCM) detects an ABS disabling malfunction.
The EBCM performs the bulb check.
The pressure differential switch is off-center due to a base brake failure (export only).
The ground circuit between the electronic brake control lamp relay and the EBCM is open (export only).
The EBCM does not power up or loses power during the ignition cycle.