Circuit Description
The instrument panel cluster (IPC) illuminates the red brake warning indicator by supplying ground to the lamp. The electronic brake control module (EBCM) sends a class 2 message to the IPC requesting illumination. The park brake switch is wired to the IPC logic. The red brake warning indicator also illuminates when the park brake is applied.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Brake Warning System Schematics and Instrument Cluster Schematics in Instrument Panel, Gages, and Console | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the brake warning indicator illuminate for 3 seconds and then turn OFF? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the brake warning indicator turn OFF? | Go to Step 4 | Go to Step 8 |
4 |
Does the brake warning indicator turn OFF? | Go to Step 6 | Go to Step 5 |
5 |
Does the scan tool display On? | Go to Step 9 | Go to Step 7 |
6 | Replace the park brake switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake. Did you complete the replacement? | Go to Step 10 | -- |
7 |
Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
8 | Replace the IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the electronic brake control module (EBCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the brake warning indicator illuminate for 3 seconds and then turn OFF? | System OK | Go to Step 3 |
