C1211

Circuit Description
The instrument cluster controls the operation of the ABS indicator. The EBCM 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 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. It 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 Running the DTC
The fault is detected when the EBCM commands the indicator OFF.

Conditions for Setting the DTC
The ABS indicator signal circuit voltage is greater than 4.5 volts for 2 seconds.

Action Taken When the DTC Sets
^ The ABS remains functional.
^ The ABS indicator remains OFF.

Conditions for Clearing the DTC
^ The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
^ The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
A possible cause of this DTC is a short to battery in the ABS indicator signal circuit.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This test uses the scan tool to check the normal state of the ABS indicator signal circuit.
3. This test ensures that the instrument cluster can operate the ABS indicator.