ABS Indicator Always On

ABS Indicator Always On

Circuit Description
The Instrument Panel Cluster (IPC) controls the operation of the Antilock Brake System (ABS) indicator. The Electronic Brake Control Module (EBCM) reports the desired status of the ABS indicator via serial data messages. The ABS indicator signal circuit is a back-up reporting circuit to the serial data messages. The EBCM supplies ground through the circuit when the ABS is operating properly. When there is a problem with ABS that should turn ON the ABS indicator, the EBCM opens the ABS indicator signal circuit. If there is a problem with the ABS serial data messages, the IPC uses the ABS indicator signal to determine if the ABS indicator should be illuminated. Using the serial data messages and back-up circuit, the IPC decides whether to turn ON the ABS indicator.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. Use the scan tool to inspect the normal state of the ABS indicator control circuit.
4. Ensures that the IPC can operate the ABS indicator.





ABS Indicator Always On