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
Circuit/System Description
For an overview of the component/system, refer to: Electronic Parking Brake
Description.
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
- Ignition/Vehicle - Off
- Disconnect the electrical connector: S91 Park Brake Control Switch
- 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
- Ignition/Vehicle - Off
- Disconnect the electrical connector: S91 Park Brake Control Switch
- 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
- Ignition/Vehicle - Off
- Disconnect the electrical connector: S91 Park Brake Control Switch
- 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
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
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.
- Ignition/Vehicle - Off
- 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.
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
READ NEXT:
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
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
DTC Descripto
Diagnostic Instructions
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 provides an overview of each
diagnostic category.
DTC Descriptor
DT