PRE-RELEASE
DTC C0293
| DTC C0293 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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. The electric parking brake module will perform diagnostics on the electric parking brake switch and its wiring harness to verify it is functioning properly. 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.
The electric park brake switch control diagnostic checks for failure conditions in the electric park brake switch and associated wiring into the electric park brake module.
| Conditions for Running the DTC |
Ignition OFF, ACCESSORY, or RUN mode.
| Conditions for Setting the DTC |
The electric parking brake 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 |
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The electric parking brake is disabled.
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A DIC message and/or a warning indicator may be displayed.
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| Conditions for Clearing the DTC |
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The electric parking brake module clears the history DTC when a current DTC is not detected in 40 ignition cycles.
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The condition for setting the DTC is no longer present.
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| Reference Information |
Schematic Reference
Park Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electronic Parking Brake Control Module Description
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
C0293 01 or C0293 06
| 1. |
Ignition OFF, disconnect the harness at the S91 Electric Parking Brake Switch.
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| 2. |
Test for B+ between the B+ circuit terminal listed below and ground:
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Terminal 4
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Terminal 5
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| 3. |
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 K83 Electric Parking Brake Control Module.
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| 4. |
Disconnect the harness at the K83 Electric Parking Brake Control Module.
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| 5. |
Ignition ON, test for less than 1 V between the following signal circuit terminals at the electric parking brake switch harness connector and ground:
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Terminal 1
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Terminal 2
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Terminal 3
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Terminal 4
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Terminal 5
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Terminal 7
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| 6. |
If greater than the specified range, test the signal circuit for a short to voltage in the circuit.
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| 7. |
Test for infinite resistance between the signal circuits listed below and ground:
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Terminal 1
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Terminal 2
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Terminal 3
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Terminal 7
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| 8. |
If less than the specified value, test the park brake signal circuit for a short to ground.
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| 9. |
Test for less than 5 Ω between the following signal circuit terminals:
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Electric parking brake switch harness terminal 1 and the electric parking brake control module terminal N
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Electric parking brake switch harness terminal 2 and the electric parking brake control module terminal C
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Electric parking brake switch harness terminal 3 and the electric parking brake control module terminal B
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Electric parking brake switch harness terminal 7 and the electric parking brake control module terminal D
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| 10. |
If greater than the specified range, test the signal circuit for an open/high resistance.
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| 11. |
If all circuits test normal, test or replace the S91 Electric Parking Brake Switch. If the DTC is set again, replace the K83 Electric Parking Brake Control Module.
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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.
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| 2. |
Test for infinite resistance between the terminals listed below with the switch in the inactive state:
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B+ terminal 4 and the park brake switch signal terminal 1
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B+ terminal 4 and the park brake switch signal terminal 2
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B+ terminal 5 and the park brake switch signal terminal 1
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B+ terminal 5 and the park brake switch signal terminal 2
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Park brake switch signal terminal 3 and the park brake switch signal terminal 1
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Park brake switch signal terminal 3 and the park brake switch signal terminal 2
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Park brake switch signal terminal 7 and the park brake switch signal terminal 1
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Park brake switch signal terminal 7 and the park brake switch signal terminal 2
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| 3. |
If less than the specified range, replace the electric parking brake switch.
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| 4. |
Test for less than 5 Ω between the terminals listed below with the switch in the inactive state:
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Park brake switch signal terminal 1 and terminal 2
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B+ terminal 4 and park brake switch signal terminal 7
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B+ terminal 5 and park brake switch signal terminal 3
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| 5. |
If greater than the specified range, replace the electric parking brake switch.
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| 6. |
Test for less than 5 Ω between the terminals listed below with the switch in the apply position:
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Park brake switch signal terminal 1 and terminal 2
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B+ terminal 4 and park brake switch signal terminal 1
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B+ terminal 4 and park brake switch signal terminal 2
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B+ terminal 5 and park brake switch signal terminal 3
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| 7. |
If greater than the specified range, replace the electric parking brake switch.
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| 8. |
Test for less than 5 Ω between the terminals listed below with the switch in the release position:
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Park brake switch signal terminal 1 and terminal 2
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B+ terminal 5 and park brake switch signal terminal 1
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B+ terminal 5 and park brake switch signal terminal 2
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B+ terminal 4 and park brake switch signal terminal 7
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| 9. |
If greater than the specified range, replace the electric parking brake switch.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Parking Brake Actuator Switch Replacement
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Electronic Parking Brake Control Module Replacement
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Control Module References
for electric parking brake module replacement, setup, and programming
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