C1211

CIRCUIT DESCRIPTION
The instrument cluster controls the operation of the ABS indicator. The EBCM/EBTCM reports the desired status of the ABS indicator via class 2 serial data messages. The ABS indicator signal circuit is a back-up reporting circuit to the class 2 serial data messages. The EBCM/EBTCM 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/EBTCM opens the ABS indicator signal circuit. If there is a problem with the ABS class 2 serial data messages, the instrument cluster uses the ABS indicator signal to determine if the ABS indicator should be illuminated. Using the serial data messages and back-up circuit, the instrument cluster decides whether to turn on the ABS indicator.

CONDITIONS FOR SETTING THE DTC
The EBCM/EBTCM commands the ABS indicator ON when one of the following conditions are detected:
^ An open
^ A short to ground
^ A short to voltage

ACTION TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ The ABS is not disabled.
^ The ABS indicator remains OFF.

CONDITIONS FOR CLEARING THE DTC
^ The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
^ The EBCM/EBTCM does not detect the DTC in 50 drive cycles.

DIAGNOSTIC AIDS
^ It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
^ An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.
^ If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Diagnostic Aids.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
3. This step tests if the instrument cluster can operate the ANTILOCK indicator.
4. This step tests for a short to ground in CKT 852.
6. This step tests for a short to voltage in CKT 852.
7. This step tests for an open in CKT 852.