C0293

DTC C0293

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provide an overview of each diagnostic category.

DTC Descriptors
DTC C0293 01
- Park Brake Switch Control Short to Battery

DTC C0293 06
- Park Brake Switch Control Low Voltage/Open

DTC C0293 08
- Park Brake Switch Control Performance-Signal Invalid

Circuit/System Description

The electric parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The electric parking brake control module also contains the logic for applying and releasing the parking brake when commanded by the electric parking brake switch. When the electric 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.

Conditions for Running the DTC

Ignition OFF, ACCESSORY, or RUN mode.

Conditions for Setting the DTC

The electric parking brake control module detects a short to battery, short to ground, open circuit, or an internal parking brake switch control malfunction.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

* The electric parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.
* The condition for the DTC is no longer present.

Reference Information
Schematic Reference

Park Brake System Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Electronic Parking Brake Control Module Description (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Test
C0293 01 or C0293 06

1. Ignition OFF, disconnect the harness at the electric parking brake switch.
2. Test for B+ between the B+ circuit terminal listed below and ground:

* Terminal 4
* Terminal 5

• If less than the specified range, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the electric parking brake module.
• If greater than the specified range, test the B+ circuit for a short to voltage. If the circuit tests normal, replace the electric parking brake module.

3. Verify a test lamp does not illuminate between the park brake signal circuits listed below and ground:

* Terminal 1
* Terminal 2
* Terminal 3
* Terminal 7

• If the test lamp does illuminate, test the park brake signal circuit for a short to voltage. If the circuit tests normal, replace the electric parking brake module.

4. Test for infinite resistance between the park brake signal circuits listed below and ground:

* Terminal 1
* Terminal 2
* Terminal 3
* Terminal 7

• If the less than the specified value, test the park brake signal circuit for a short to ground. If the circuit tests normal, replace the electric parking brake module.

5. Verify a test lamp illuminates between the following circuit terminals listed below:

* B+ terminal 4 and park brake signal terminal 7
* B+ terminal 4 and park brake signal terminal 1
* B+ terminal 5 and park brake signal terminal 3
* B+ terminal 5 and park brake signal terminal 2

• If the test lamp does not illuminate, test the park brake signal circuit for an open/high resistance. If the circuit tests normal, replace the electric parking brake module.

6. If all circuits test normal, test or replace the electric parking brake switch.

C0293 08

Remove the EPB fuse and reinstall. Verify DTC C0293 08 is not set.

If DTC C0293 08 is set replace the electric parking brake switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the electric parking brake 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 switch signal terminal 1
* B+ terminal 4 and the park brake switch signal terminal 2
* B+ terminal 5 and the park brake switch signal terminal 1
* B+ terminal 5 and the park brake switch signal terminal 2
* Park brake switch signal terminal 3 and the park brake switch signal terminal 1
* Park brake switch signal terminal 3 and the park brake switch signal terminal 2
* Park brake switch signal terminal 7 and the park brake switch signal terminal 1
* Park brake switch signal terminal 7 and the park brake switch signal terminal 2

• If less than the specified range, replace the electric parking brake switch.

3. Test for less than 5 Ohms between the terminals listed below with the switch in the inactive state:

* Park brake switch signal terminal 1 and terminal 2
* B+ terminal 4 and park brake switch signal terminal 7
* B+ terminal 5 and park brake switch signal terminal 3

• If greater than the specified range, replace the electric parking brake switch.

4. Test for less than 5 Ohms between the terminals listed below with the switch in the apply position:

* Park brake switch signal terminal 1 and terminal 2
* B+ terminal 4 and park brake switch signal terminal 1
* B+ terminal 4 and park brake switch signal terminal 2
* B+ terminal 5 and park brake switch signal terminal 3

• If greater than the specified range, replace the electric parking brake switch.

5. Test for less than 5 Ohms between the terminals listed below with the switch in the release position:

* Park brake switch signal terminal 1 and terminal 2
* B+ terminal 5 and park brake switch signal terminal 1
* B+ terminal 5 and park brake switch signal terminal 2
* B+ terminal 4 and park brake switch signal terminal 7

• If greater than the specified range, replace the electric parking brake switch.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Electronic Parking Brake Control Module Replacement (Service and Repair)
* Parking Brake Switch Replacement (Parking Brake Switch Replacement)
* Control Module References (Programming and Relearning) for electric parking brake control module replacement, setup, and programming.