Buick Regal Owners & Service Manuals

Buick Regal: DTC C0293

Diagnostic Instructions

  • Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
  • Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis
  • An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC C0293

Park Brake Switch Circuit

Symptom Byte Information: Symptom Byte List.

Diagnostic Fault Information

Park Brake

Park Brake

Circuit/System Description

For an overview of the component/system, refer to: Electronic Parking Brake Description.

Park Brake

Park Brake

Conditions for Running the DTC

System Voltage=9 to 16 V

Conditions for Setting the DTC

  • K20 Engine Control Module = Short to Ground - S91 Park Brake Control Switch
  • K20 Engine Control Module = Short to Voltage - S91 Park Brake Control Switch
  • K20 Engine Control Module = Open/High Resistance - S91 Park Brake Control Switch
  • K20 Engine Control Module = Malfunction - S91 Park Brake Control Switch
  • S91 Park Brake Control Switch = Activated - Greater than 90 s

Actions Taken When the DTC Sets

  • Parking Brake Actuator = Disabled
  • A message and/or warning indicator may be displayed to the driver.

Conditions for Clearing the DTC

  • The conditions for setting the DTC no longer exist.
  • A history DTC will clear after 40 consecutive malfunction-free ignition cycles.

Reference Information

Schematic Reference

Park Brake System Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEW INDEX

Electrical Information Reference

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

Scan Tool Reference

Control Module References

Circuit/System Verification

1. Ignition - On / Vehicle - In Service Mode.

2. Press and release the switch:S91 Park Brake Control Switch.

3. Verify the scan tool parameter:Park Brake Switch=Apply & Released.

  • If the parameter state does not change

Refer to: Circuit/System Testing

  • Go to next step: If the parameter state changes

4. All OK.

Circuit/System Testing

1. Ignition/Vehicle - Off.

2. Disconnect the electrical connector:K17 Electronic Brake Control Module.

3. Ignition - On / Vehicle - In Service Mode.

4. Test for less than 1 V between the test points:

  • Terminal 16@K17 Electronic Brake Control Module & Ground
  • Terminal 32@K17 Electronic Brake Control Module & Ground
  • Terminal 9@K17 Electronic Brake Control Module & Ground
  • Terminal 15@K17 Electronic Brake Control Module & Ground
  • Terminal 31@K17 Electronic Brake Control Module & Ground
  • Terminal 8@K17 Electronic Brake Control Module & Ground
  • If 1 V or greater

Repair the short to voltage on the circuit:

  • Go to next step: If less than 1 V

5. Ignition/Vehicle - Off.

6. Test for infinite resistance between the test points:

  • Terminal 16@K17 Electronic Brake Control Module & Ground
  • Terminal 32@K17 Electronic Brake Control Module & Ground
  • Terminal 9@K17 Electronic Brake Control Module & Ground
  • Terminal 15@K17 Electronic Brake Control Module & Ground
  • Terminal 31@K17 Electronic Brake Control Module & Ground
  • Terminal 8@K17 Electronic Brake Control Module & Ground
  • If less than infinite resistance

Repair the short to ground on the circuit.

  • Go to next step: If infinite resistance

7. Test for less than 5 ohms between the test points: Terminal 32 & Terminal 31

  • If 5 ohms or greater
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S91 Park Brake Control Switch
  3. Test for less than 2 ohms between the test points:
    • Terminal 32@Control module harness & The other end of the circuit@Component harness
    • Terminal 31@Control module harness & The other end of the circuit@Component harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component: S91 Park Brake Control Switch
  • Go to next step: If less than 5 ohms

8. Test for less than 5 ohms between the test points: Terminal 8 & Terminal 15

  • If 5 ohms or greater
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S91 Park Brake Control Switch
  3. Test for less than 2 ohms between the test points:
    • Terminal 8@Control module harness & The other end of the circuit@Component harness
    • Terminal 15@Control module harness & The other end of the circuit@Component harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component: S91 Park Brake Control Switch
  • Go to next step: If less than 5 ohms

9. Test for less than 5 ohms between the test points: Terminal 9 & Terminal 16

  • If 5 ohms or greater
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S91 Park Brake Control Switch
  3. Test for less than 2 ohms between the test points:
    • Terminal 9@Control module harness & The other end of the circuit@Component harness
    • Terminal 16@Control module harness & The other end of the circuit@Component harness
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component: S91 Park Brake Control Switch
  • Go to next step: If less than 5 ohms

10. Test for less than 5 ohms between the test points: Terminal 9 & Terminal 31 - Control Switch Pressed

  • If 5 ohms or greater

Replace the component:S91 Park Brake Control Switch

  • Go to next step: If less than 5 ohms

11. Test for less than 5 ohms between the test points: Terminal 9 & Terminal 15 - Control Switch Pressed

  • If 5 ohms or greater

Replace the component: S91 Park Brake Control Switch

  • Go to next step: If less than 5 ohms

12. Ignition/Vehicle & All vehicle systems - Off.

13. Disconnect the electrical connector: S91 Park Brake Control Switch.

14. Test for less than 10 ohms between the test points: Terminal 8@S91 Park Brake Control Switch & Ground.

  • If 10 ohms or greater
  1. Ignition/Vehicle - Off
  2. Test for less than 2 ohms between the test points:Terminal 8@S91 Park Brake Control Switch & The other end of the circuit@Ground Connection
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Repair the open/high resistance in the ground connection.
  • Go to next step: If less than 10 ohms

15. Replace the component: S91 Park Brake Control Switch.

16. Operate the vehicle within the Conditions for Running the DTC.

17. Verify the DTC does not set.

  • If the DTC is set

Replace the component: K17 Electronic Brake Control Module

  • Go to next step: If the DTC does not set

18. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

  • Parking Brake Actuator Switch Replacement
  • For control module replacement, programming, and setup refer to:Control Module References

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