B0665
DTC B0665
Circuit Description
The instrument cluster controls the operation of the 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 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B0665 Service ABS Indicator Circuit
Conditions for Running the DTC
* The ignition is ON.
* Ignition voltage is greater than 8 volts.
Conditions for Setting the DTC
One of the following conditions exist for 0.3 seconds:
* The ABS indicator signal circuit voltage is greater than 9 volts when the ABS indicator is commanded ON.
* The ABS indicator signal circuit voltage is less than 3 volts when the ABS indicator is commanded OFF.
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 and the DTC is cleared with a scan tool.
* The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The following conditions may cause this concern:
* Open, short to ground, or short to voltage.
* Internal EBCM failure.
* Internal IPC failure.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Use the scan tool to verify the normal state of the ABS indicator signal circuit.
3. Ensure that the instrument panel cluster can operate the ABS indicator.
