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Park Brake Will Not Hold or Release > < Park Brake System Diagnosis - Disc Brakes

Astra J

DTC C0293

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 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 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 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


Connector End View Reference

Component Connector End Views


Description and Operation

Electronic Parking Brake Control Module Description


Electrical Information Reference


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Test


C0293 01 or C0293 06

1. Ignition OFF, disconnect the harness at the S91 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 K83 Electric Parking Brake Control Module.
⇒ If greater than the specified range, test the B+ circuit for a short to voltage. If the circuit tests normal, replace the K83 Electric Parking Brake Control Module.
3. Disconnect the harness at the K83 Electric Parking Brake Control Module.
4. Ignition ON, test for less than 1 V between the following signal circuit terminals at the electric parking brake switch harness connector and ground:
  •  Terminal 1
  •  Terminal 2
  •  Terminal 3
  •  Terminal 7
⇒ If greater than the specified range, test the signal circuit for a short to voltage.
5. Test for infinite resistance between the signal circuits listed below and ground:
  •  Terminal 1
  •  Terminal 2
  •  Terminal 3
  •  Terminal 7
⇒ If less than the specified value, test the park brake signal circuit for a short to ground.
6. Test for less than 5 Ω between the following signal circuit terminals:
  •  Electric parking brake switch harness terminal 1 and the electric parking brake control module terminal N
  •  Electric parking brake switch harness terminal 2 and the electric parking brake control module terminal C
  •  Electric parking brake switch harness terminal 3 and the electric parking brake control module terminal B
  •  Electric parking brake switch harness terminal 7 and the electric parking brake control module terminal D
⇒ If greater than the specified range, test the signal circuit for an open/high resistance.
7. If all circuits test normal, test or replace the S91 Electric Parking Brake Switch. If DTC resets, replace the K83 Electric Parking Brake Control Module.

C0293 08

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

If DTC C0293 08 is set, replace the S91 Electric Parking Brake Switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the S91 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 S91 Electric Parking Brake Switch.
3. Test for less than 5 Ω 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 S91 Electric Parking Brake Switch.
4. Test for less than 5 Ω 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 S91 Electric Parking Brake Switch.
5. Test for less than 5 Ω 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 S91 Electric Parking Brake Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Park Brake Will Not Hold or Release > < Park Brake System Diagnosis - Disc Brakes