Did you perform the park brake diagnostic system check?

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Go to Step 2

Go to Diagnostic System Check - Park Brake

1. Turn ON the ignition, with the engine OFF
2. Attempt to set the park brake.

Does the BRAKE indicator illuminate?

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Go to Step 3

Go to BRAKE Indicator Inoperative

1. Turn the ignition switch to OFF.
2. Remove the PRK BRK fuse from the rear fuse block.
3. Connect a DMM set to amps scale across the terminals of the removed fuse.
4. Connect a scan tool to the data link connector (DLC) and turn the ignition switch to ON.
5. Establish communication with the rear integration module (RIM).
6. Under special functions menu, select output control.
7. With a scan tool, command the park brake relay A (park brake release relay) on and off.

Does the current through the DMM change from high to low as the relay cycles?

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Go to Step 4

Go to Step 11

With a scan tool, command the park brake relay B (park brake ratchet relay) on and off.

Does the current through the DMM change from high to low as the relay cycles?

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Go to Step 14

Go to Step 5

1. Reinstall PRK/BRK fuse.
2. Disconnect the park brake release solenoid connector.
3. Turn the ignition switch to ON.
4. With a scan tool establish communication with the rear integration module (RIM).
5. Under special functions menu, select output control.
6. Measure the voltage from the park brake relay A switch side control circuit to a good ground at the park brake release solenoid connector.
7. With a scan tool, command park brake relay A (park brake ratchet relay) ON and OFF.

Does the voltage measure from 0 to the specified value on command?

Battery Positive Voltage (B+)

Go to Step 11

Go to Step 6

1. Remove park brake relay A from the rear fuse block.
2. With a DMM connected to battery positive voltage (B+), probe the park brake relay A control circuit.
3. With a scan tool, command the park brake relay A on and off.

Does the voltage measure from 0 to the specified value on command?

Battery Positive Voltage (B+)

Go to Step 8

Go to Step 7

Test the Park Brake Relay A control circuit for a short to ground.

Did you find and correct the condition?

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Go to Step 16

Go to Step 14

1. Turn the ignition switch to OFF.
2. Install a known good relay in place of park brake relay A.
3. Turn the ignition switch to ON.
4. Connect a DMM from the park brake relay A switch side control circuit to a good ground, at the park brake release solenoid.
5. With a scan tool as in step 4, command park brake relay A ON and OFF.

Does the voltage measure from 0 to the specified value on command?

Battery Positive Voltage (B+)

Go to Step 10

Go to Step 9

Repair short to battery positive voltage (B+) in the Park Brake Relay A switch side control circuit. Refer to Wiring Repairs in Wiring Systems

Did you complete the repair?

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Go to Step 16

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1. Inspect for poor connections at the rear fuse block of the park brake relay A .
2. If OK, park brake relay A (already replaced in step 8) is faulty.

Is the replacement complete?

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Go to Step 16

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1. Using the scan tool, establish communication with the instrument cluster (IPC).
2. From the data inputs menu, select park brake input.
3. Momentarily connect a fused jumper from the instrument cluster park brake input circuit at the park brake release solenoid to a good ground, then disconnect the jumper.

Does the cluster park brake input parameter, change state as the jumper is connected, then removed?

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Go to Step 13

Go to Step 12

Test the Park Brake Input circuit for a short to ground.

Did you find and correct the condition?

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Go to Step 16

Go to Step 13

Inspect for poor connections at the harness connector of the park brake release solenoid connector.

Did you find and correct the condition?

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Go to Step 16

Go to Step 15

1. Check rear integration module (RIM) connector C2 for poor terminal contact.
2. If OK, replace RIM. Refer to Rear Integration Body Control Module Replacement in Body Control System.

Did you the complete replacement?

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Go to Step 16

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Replace the park brake release solenoid. Refer to Parking Brake Lever Pedal Assembly Replacement

Did you complete the replacement?

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Go to Step 16

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Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 3