Operation CHARM: Car repair manuals for everyone.

C0286








Circuit Description
The amber ABS indicator lamp is supplied ignition voltage through the GAUGES fuse. The output of the EBCM will be high (battery voltage) when the ABS indicator lamp is off, and will be low (ground) when the ABS indicator lamp is on. If a DTC C0286 sets, the EBCM will store the DTC in memory but will not disable the ABS. If a DTC C0286is in memory and a different DTC sets which also requires the ABS indicator lamp to turn on, the EBCM will turn on the red BRAKE warning lamp to notify the driver of the problem.

Conditions for Running the DTC
^ The ignition switch is in the RUN position.
^ The bulb check is complete.

Conditions for Setting the DTC
^ High voltage present on the ABS indicator lamp control circuit when low voltage is expected (lamp is turned on)
^ Anything that keeps the ABS indicator lamp circuit high when the lamp is expected to be on

Action Taken When the DTC Sets
^ The ABS is not disabled.
^ The EBCM will use the red BRAKE warning lamp in order to alert the driver of an ABS malfunction.

Conditions for Clearing the DTC
^ Repair the conditions responsible for setting the DTC.
^ Use the Scan Tool Clear DTCs function.

Diagnostic Aids
DTC C0286 typically sets because of a shorted ABS indicator lamp. Yet DTC C0286 can also set because of a short to voltage in the wiring between the ABS indicator lamp and the EBCM.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. Use the scan tool to verify ABS indicator lamp operation.
3. This step determines if a short to voltage condition is responsible for setting the DTC.
4. This step determines if an open circuit condition is responsible for setting the DTC.