C1211

DTC C1211 ABS Indicator Lamp Circuit Malfunction






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.

Action 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

- Perform a thorough inspection of the wiring and the connectors. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
- An intermittent malfunction may 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.

Test Description

The numbers below refer to step numbers on the diagnostic table.

3. Checks if the IPC has the ability to operate the ABS indicator lamp.
4. Checks for a short to ground in CKT 852.
6. Checks for a short to voltage in CKT 852.
7. Checks for an open in CKT 852.