C1211

CIRCUIT DESCRIPTION
The instrument cluster controls the operation of the ANTILOCK indicator. The EBTCM reports the desired status of the ANTILOCK indicator via serial data class 2 messages. The hard wired circuit is a back-up reporting circuit. The EBTCM supplies ground through the circuit when the ABS is operating properly. Using the serial data messages and back-up circuit, the instrument cluster decides whether to turn on the ANTILOCK indicator.

CONDITIONS FOR SETTING THE DTC
All of the following conditions occur:
^ The EBTCM commands the ANTILOCK indicator ON.
^ The EBTCM detects one of the following conditions in the ANTILOCK indicator control circuit:
^ An open
^ A short to ground
^ A short to voltage

ACTIONS TAKEN WHEN THE DTC SETS
^ A malfunction DTC is stored.
^ The ABS remains functional.
^ For a short, the ABS indicator remains OFF.
^ For an open, the ABS indicator is turned ON.

CONDITIONS FOR CLEARING THE DTC
^ The condition for DTC is no longer present and you used scan tool Clear DTCs function.
^ The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
^ The 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 Wiring Systems.

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