Circuit Description
The park brake switch monitors if the park brake is engaged. When the body control module (BCM) sees the park brake switch input grounded, it sends a serial data message to the instrument panel cluster (IPC) requesting illumination of the red brake indicator.
Conditions for Running the DTC
The vehicle speed is greater than 8 km/h (5 mph).
Conditions for Setting the DTC
The BCM detects a ground on the park brake switch signal circuit for longer than 2 seconds.
Action Taken When the DTC Sets
The red brake warning indicator turns on.
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Brake Warning System Schematics Connector End View Reference: Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | |||
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 scan tool indicate that the Park Brake Switch parameter is OK? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the scan tool indicate that the Park Brake Switch parameter is OK? | Go to Step 5 | Go to Step 4 |
4 | Test the signal circuit of the park brake switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
5 | Replace the park brake switch. Refer to Parking Brake Indicator Switch Replacement . Did you complete the repair? | Go to Step 7 | -- |
6 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems. Did you complete the repair? | Go to Step 7 | -- |
7 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
