Circuit Description
The red BRAKE warning lamp is supplied ignition voltage through the GAUGES fuse. The BRAKE warning lamp can be illuminated with a ground supplied by the EBCM, Brake Pressure Differential Switch or by the Park Brake Switch.
Conditions for Setting the DTC
| • | High voltage is 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 DTC
| • | Repair the conditions responsible for setting the DTC |
| • | Use the Scan Tool Clear DTCs function |
Diagnostic Aids
DTC C0288 is usually set by a short to voltage in the wiring between the brake warning lamp and the EBCM.
Test Description
The numbers below refer to the steps in the diagnostic table:
-
Determines if the BRAKE warning lamp circuit is operating properly when controlled by the EBCM.
-
Determines if the BRAKE warning lamp circuit is operating properly without the EBCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | ||
Did the BRAKE warning lamp turn on and then off after three seconds? | -- | |||
Does the BRAKE warning lamp turn on? | -- | |||
4 | Inspect the Jumper wire Fuse. Is the fuse open? | -- | ||
5 | Malfunction is intermittent. Perform the following:
Is repair complete? | -- | -- | |
6 | Replace the EBCM. Is repair complete? | -- | -- | |
7 | Repair a short to voltage in CKT 33. Is repair complete? | -- | -- |
