For 1990-2009 cars

### Circuit Description

The park brake switch monitors if the park brake is engaged. When the BCM sees the park brake switch input grounded, it sends a serial data message to the 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

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

• | The 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: Hydraulic Brake Connector End Views
1 | Did you perform the Hydraulic Brake Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Hydraulic Brakes
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Park Brake Switch parameter in the BCM data list.

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 |

1. Turn OFF the ignition.
2. Disconnect the park brake switch.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the Park Brake Switch parameter.

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 Body Control Module Replacement in Body Control System. 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