For 1990-2009 cars

### 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 provide an overview of each diagnostic category.

### DTC Descriptors

DTC C0574 01: Circuit Board Temperature Sensor Short to Battery
DTC C0574 02: Circuit Board Temperature Sensor Short to Ground
DTC C0574 54: Circuit Board Temperature Sensor High

### 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

#### C0574 01, C0574 02

The electric parking brake control module detects a short to battery or a short to ground.

#### C0574 54

The electric parking brake control module has detected an internal temperature that is above the allowed value.

### Action Taken When the DTC Sets

• | A message and/or a warning indicator may be displayed.

• | The electric parking brake is disabled, one release allowed.

### 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 electric parking brake control module is replaced or the internal temperature drops below the allowed temperature.

### Diagnostic Aids

Check for debris on the electric parking brake control module which may cause the module to overheat.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

#### C0574 01 or C0574 02

Remove the EPB fuse and reinstall. Verify DTC C0574 is not set.

⇒ | If DTC is set, replace the K83 Electric Parking Brake Control Module.

#### C0574 54

Note: Diagnose all other parking brake control module system related faults before performing this diagnostic. Other faults may cause the circuit board to overheat. Do not attempt to apply the electric parking brake.

1. Allow the electric parking brake control module to cool down for 15 minutes.
2. Verify DTC C0574 54 is not set.

⇒ | If DTC is set, replace the K83 Electric Parking Brake Control Module.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for electric parking brake control module replacement, setup, and programming