• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.

For symptom byte information, refer to: Symptom Byte List

The parking brake function is integrated into the Electronic Brake Control Module. The Electronic Brake Control Module contains the logic for applying and releasing the parking brake when commanded by the Park Brake Switch. The Electronic Brake Control Module will perform diagnostics on the Park Brake Switch and its wiring harness to verify it is functioning properly.

The Park Brake Switch diagnostic checks for failure conditions in the Park Brake Switch and associated wiring into the Electronic Brake Control Module.

Ignition OFF, ACCESSORY, or RUN mode.

The Electronic Brake Control Module detects a short to battery, short to ground, open circuit, or an internal Parking Brake Control Switch malfunction. The Electronic Brake Control Module detects the apply or release button was activated for more than 90 s.

• The parking brake is disabled.
• A message and/or a warning indicator may be displayed.

• The Electronic Brake Control Module will clear the DTC after 40 consecutive ignition on/off cycles with at least one test pass in each ignition cycle and no test fail result.
• The condition for the DTC is no longer present.
• The Park Brake Switch button is INACTIVE using the scan tool without the switch being activated.

Park Brake System Schematics

Master Electrical Component List

Electronic Parking Brake Description

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool Park Brake Switch parameter changes between Released and Apply while pressing and releasing the B80 Park Brake Switch.
• If the parameter does not change

  Refer to Circuit/System Test.

• If the parameter changes
3. All OK.

1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module. Ignition ON.
2. Test for less than 1 V between each circuit terminals listed below and ground;
• Terminal 17
• Terminal 18
• Terminal 19
• Terminal 23
• Terminal 24
• Terminal 25
• If 1 V or greater

  Repair the short to voltage on the circuit.

• If less than 1 V
3. Ignition OFF.
4. Test for infinite resistance between the circuit terminals listed below and ground;
• Terminal 17
• Terminal 18
• Terminal 19
• Terminal 23
• Terminal 24
• Terminal 25
• If less than infinite resistance

  Repair the short to ground on the circuit.

• If infinite resistance
5. Test for less than 5 Ω between the circuit terminal 18 and the circuit terminal 24.
• If 5 Ω or greater
1. Ignition OFF, disconnect the harness connector at the B80 Park Brake Switch.
2. Test for less than 2 Ω in the circuits end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the B80 Park Brake Switch.
• If less than 5 Ω
6. Test for less than 5 Ω between the circuit terminal 25 and the circuit terminal 23.
• If 5 Ω or greater
1. Ignition OFF, disconnect the harness connector at the B80 Park Brake Switch.
2. Test for less than 2 Ω in the circuits end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the B80 Park Brake Switch.
• If less than 5 Ω
7. Test for less than 5 Ω between the circuit terminal 17 and the circuit terminal 19.
• If 5 Ω or greater
1. Ignition OFF, disconnect the harness connector at the B80 Park Brake Switch.
2. Test for less than 2 Ω in the circuits end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the B80 Park Brake Switch.
• If less than 5 Ω
8. Test for less than 5 Ω between the circuit terminal 19 and the circuit terminal 24 while closing the switch.
• If 5 Ω or greater

  Replace the B80 Park Brake Switch.

• If less than 5 Ω
9. Test for less than 5 Ω between the circuit terminal 19 and the circuit terminal 23 while closing the switch.
• If 5 Ω or greater

  Replace the B80 Park Brake Switch.

• If less than 5 Ω
10. Ignition OFF, all access doors closed, all vehicle systems OFF, disconnect the harness connector at the B80 Park Brake Switch.
11. Test for less than 10 Ω between the ground circuit at the B80 Park Brake Switch and ground.
• If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, repair the open/high resistance in the ground connection.
• If less than 10 Ω
12. Replace the B80 Park Brake Switch.
13. Verify that DTC C0293 does not set while operating the vehicle within the Conditions for Running the DTC.
• If the DTC sets

  Replace the K17 Electronic Brake Control Module.

• If DTC does not set
14. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

• Parking Brake Switch Replacement
• Control Module References for K17 Electronic Brake Control Module replacement, programming and setup.