C0293
DTC C0293
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptors
DTC C0293 00
- Park Brake Switch Malfunction
DTC C0293 01
- Park Brake Switch Short to Battery
DTC C0293 02
- Park Brake Switch Short to Ground
DTC C0293 04
- Park Brake Switch Open
DTC C0293 06
- Park Brake Switch Low Voltage/Open
DTC C0293 08
- Park Brake Switch Performance - Signal Invalid
Diagnostic Fault Information
Circuit/System Description
The parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The parking brake control module also contains the logic for applying and releasing the parking brake when commanded by the park brake control switch. The parking brake control module will perform diagnostics on the park brake control switch and its wiring harness to verify it is functioning properly. When the parking brake control module receives a signal from the switch the internal circuit board temperature is checked to verify it is within operating range before the control module performs the requested operation.
The park brake switch control diagnostic checks for failure conditions in the park brake switch and associated wiring into the parking brake control module.
Conditions for Running the DTC
Ignition OFF, ACCESSORY, or RUN mode.
Conditions for Setting the DTC
The parking brake control module detects a short to battery, short to ground, open circuit, or an internal parking brake switch malfunction. The parking brake control module detects the apply or release button was activated for more than 90 seconds.
Action Taken When the DTC Sets
* The parking brake is disabled.
* A message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The parking 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 control switch button is INACTIVE using the scan tool without the switch being activated.
Reference Information
Schematic Reference
Park Brake System Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Description and Operation
Electronic Parking Brake Control Module Description Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool Park Brake Status parameter changes between Released and Apply while pressing and releasing the S91 park brake control switch.
• If the parameter does not change
Refer to Circuit/System Test.
• If the parameter changes
3. All OK.
Circuit/System Test
C0293 01, C0293 02, C0293 04 or C0293 06
1. Ignition OFF, disconnect the harness at the S91 park brake control switch.
2. Test for greater than 11.5 V between the B+ circuit terminal listed below and ground:
* Terminal 1
* Terminal 4
* Terminal 5
• If 11.5 V or less
1. Ignition OFF, disconnect the harness connector at the K83 parking brake control module.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K83 parking brake control module.
• If greater than 11.5 V
3. Connect the harness connector at the S91 park brake control switch. Disconnect the harness connector at the K83 parking brake control module.
4. Ignition ON, test for greater than 11.5 V between the ignition circuit terminal P and ground:
• If 11.5 V or less
1. Ignition OFF, test for infinite resistance between the ignition circuit terminal P and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms and the fuse is blown, replace the K83 parking brake control module.
• If greater than 11.5 V
5. Ignition OFF, test for less than 1 V between the circuit terminals listed below and ground:
* B+ circuit terminal N
* B+ circuit terminal R
* B+ circuit terminal S
* Signal circuit terminal B
* Signal circuit terminal C
* Signal circuit terminal D
• If 1 V or greater
Repair the short to voltage on the circuit.
• If less than 1 V
6. Test for infinite resistance between the signal circuit terminals listed below and ground:
* Signal circuit terminal B
* Signal circuit terminal C
* Signal circuit terminal D
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
7. Test for less than 5 ohms between the signal circuit terminal D and the B+ circuit terminal R.
• If 5 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S91 park brake control switch.
2. Test for less than 2 ohms in the signal circuit terminal D end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, test or replace the S91 park brake control switch.
• If less than 5 ohms
8. Test for less than 5 ohms between the signal circuit terminal B and the B+ circuit terminal S.
• If 5 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S91 park brake control switch.
2. Test for less than 2 ohms in the signal circuit terminal B end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, test or replace the S91 park brake control switch.
• If less than 5 ohms
9. Test for less than 5 ohms between the signal circuit terminal C and the B+ circuit terminal N.
• If 5 ohms or greater
1. Ignition OFF, disconnect the harness connector at the S91 park brake control switch.
2. Test for less than 2 ohms in the signal circuit terminal C end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, test or replace the S91 park brake control switch.
• If less than 5 ohms
10. Replace the K83 parking brake control module.
C0293 00 or C0293 08
1. Ignition ON.
2. Verify no additional DTCs are set in other control modules.
• If additional DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle
• If no additional DTCs are set
3. Verify DTC C0293 00 or C0293 08 is not set.
• If DTC C0293 00 or C0293 08 is set
1. Ignition OFF, remove the parking brake control module fuse and reinstall, ignition ON.
2. Verify DTC C0293 00 or C0293 08 is not set.
• If the DTC is set,
replace the K83 parking brake control module.
• If the DTC is not set
3. All OK.
• If DTC C0293 00 or C0293 08 is not set
4. All OK.
Component Testing
1. Ignition OFF, disconnect the harness connector at the S91 park brake control switch.
2. Test for infinite resistance between the terminals listed below with the switch in the inactive state:
* B+ terminal 4 and the park brake control switch signal terminal 1
* B+ terminal 4 and the park brake control switch signal terminal 2
* B+ terminal 5 and the park brake control switch signal terminal 1
* B+ terminal 5 and the park brake control switch signal terminal 2
* Park brake control switch signal terminal 3 and the park brake control switch signal terminal 1
* Park brake control switch signal terminal 3 and the park brake control switch signal terminal 2
* Park brake control switch signal terminal 7 and the park brake control switch signal terminal 1
* Park brake control switch signal terminal 7 and the park brake control switch signal terminal 2
• If less than infinite resistance
Replace the S91 park brake control switch.
• If infinite resistance
3. Test for less than 5 ohms between the terminals listed below with the switch in the inactive state:
* Park brake control switch signal terminal 1 and terminal 2
* B+ terminal 4 and park brake control switch signal terminal 7
* B+ terminal 5 and park brake control switch signal terminal 3
• If 5 ohms or greater
Replace the S91 park brake control switch.
• If less than 5 ohms
4. Test for less than 5 ohms between the terminals listed below with the switch in the apply position:
* Park brake control switch signal terminal 1 and terminal 2
* B+ terminal 4 and park brake control switch signal terminal 1
* B+ terminal 4 and park brake control switch signal terminal 2
* B+ terminal 5 and park brake control switch signal terminal 3
• If 5 ohms or greater
Replace the S91 park brake control switch.
• If less than 5 ohms
5. Test for less than 5 ohms between the terminals listed below with the switch in the release position:
* Park brake switch control signal terminal 1 and terminal 2
* B+ terminal 5 and park brake control switch signal terminal 1
* B+ terminal 5 and park brake control switch signal terminal 2
* B+ terminal 4 and park brake control switch signal terminal 7
• If 5 ohms or greater
Replace the S91 park brake control switch.
• If less than 5 ohms
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Parking Brake Actuator Switch Replacement Service and Repair
* Control Module References Control Module References for parking brake control module replacement, programming and setup