For 1990-2009 cars

### Circuit Description

The PBCM illuminates the SERVICE PARK BRAKE indicator if a malfunction is detected in the park brake system. The PBCM illuminates the SERVICE PARK BRAKE indicator by supplying voltage to the lamp.

### Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

• | Testing for Electrical Intermittents

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

• | Connector Repairs

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Park Brake System Schematics
1 | Did you perform the Parking Brake Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Park Brake
2 | Turn ON the ignition. Does the SERVICE PARK BRAKE indicator remain ON? | Go to Step 3 | Go to Diagnostic Aids
3 | Disconnect from the PBCM, the harness connector containing the park brake failure control circuit. Does the SERVICE PARK BRAKE indicator turn OFF? | Go to Step 6 | Go to Step 4
4 |

1. Disconnect from the instrument panel cluster, the harness connector containing the park brake failure control circuit. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.
2. Test the park brake failure control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 5

5 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 7 | --
6 | Replace the PBCM. Refer to Park Brake Control Module Replacement . Did you complete the replacement? | Go to Step 7 | --
7 | Turn ON the ignition. Does the SERVICE PARK BRAKE indicator remain ON? | Go to Step 3 | System OK