Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Listen for an audible click when the park brake relay A operates. Command both the ON and OFF states. Repeat the commands as necessary.
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Listen for an audible click when the park brake relay B operates. Command both the ON and OFF states. Repeat the commands as necessary.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Park Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check-Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the park brake relay A turn ON and OFF with each command? | Go to Step 3 | Go to Step 4 | |
With a scan tool, command the park brake relay B ON and OFF. Does the park brake relay B turn ON and OFF with each command? | Go to Step 6 | Go to Step 5 | |
4 |
Does the park brake set? | Go to Step 11 | Go to Step 8 |
5 |
Does the park brake set? | Go to Step 11 | Go to Step 9 |
6 | Test the supply voltage circuit of the park brake relay A 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 19 | Go to Step 7 |
7 | Test the supply voltage circuit of the park brake relay B 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 19 | Go to Step 10 |
8 | Test the control circuit of the park brake relay A 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 19 | Go to Step 15 |
9 | Test the control circuit of the park brake relay B 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 19 | Go to Step 16 |
10 | Inspect for poor connections at the harness connector of the park brake release solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 19 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 19 | Go to Step 18 |
12 | Inspect the park brake system for proper operation. Refer to Park Brake System Diagnosis . Did you find and correct the condition? | Go to Step 19 | Go to Step 13 |
13 | Inspect the disc brake system for proper operation. Refer to Disc Brake System Diagnosis in Hydraulic Brakes. Did you find and correct the condition? | Go to Step 19 | Go to Step 14 |
14 | Inspect the hydraulic brake system for proper operation. Refer to Hydraulic Brake System Diagnosis in Hydraulic Brakes. Did you find and correct the condition? | Go to Step 19 | Go to Step 17 |
15 | Replace the park brake relay A. Did you complete the replacement? | Go to Step 19 | -- |
16 | Replace the park brake relay B. Did you complete the replacement? | Go to Step 19 | -- |
17 | Replace the park brake release solenoid. Refer to Park Brake Release Solenoid Replacement . Did you complete the replacement? | Go to Step 19 | -- |
18 | Replace the body control module (BCM). Refer to Body Control Module Replacement in Computer/Integrating Systems. Did you complete the replacement? | Go to Step 19 | -- |
19 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
