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), Brake Pressure Warning 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 MIL/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.
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This step determines if the BRAKE warning lamp circuit is operating properly without the EBCM.
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This step decides between a constant or intermittent short to voltage condition.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Step 2 | |||||||
Did the BRAKE warning lamp turn on and then off after two seconds? | -- | Go to Step 6 | Go to Step 3 | |||||||
Does the BRAKE warning lamp turn on? | -- | Go to Step 7 | Go to Step 5 | |||||||
Inspect the jumper wire fuse Is the fuse open? | -- | Go to Step 8 | Go to Step 6 | |||||||
6 | Malfunction is intermittent, Perform the following:
Is the repair complete? | -- | -- | |||||||
7 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- | |||||||
8 | Repair a short to voltage in CKT 680. Refer to Wiring Repairs . Is the repair complete? | -- | -- |
