C0288

Circuit Description
The red BRAKE warning lamp is supplied ignition voltage through the GAUGES fuse. The BRAKE warning lamp can be illuminated by the EBCM, Daytime Running Lights Module (DRL) or Brake Pressure Warning Switch. If a DTC C0288 sets, the EBCM will store in memory but will not disable the ABS. If a DTC C0288is in memory, the EBCM will not attempt to perform a BRAKE warning lamp bulb check at start-up. Also the EBCM will not attempt to use the BRAKE indicator lamp as a backup if the ABS indicator lamp operation is inhibited by a DTC C0286.

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 BRAKE warning lamp circuit when the circuit is expected to be low (lamp commanded on by the EBCM)
^ Anything that keeps the Brake warning lamp circuit high when the lamp is supposed to be illuminated (such as a short to voltage on CKT 33)

Action Taken When the DTC Sets
No action taken, the ABS is not disabled.

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

Diagnostic Aids
DTC C0288is usually set by a short to voltage in the wiring between the brake warning 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 in order to verify BRAKE 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.