2010 Cadillac CTS Sedan AWD V6-3.6L Page 709
瀚慖f the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
4. Ignition OFF, connect a test lamp between the signal circuit terminal 52 at the ECM harness connector and the connector terminal at the
ECM.
5. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when
changing between the selected states.
瀚慖f the test lamp does not turn ON and OFF when commanded, replace the ECM.
6. Ignition OFF, connect the harness connector at the ECM.
7. Disconnect the harness connector at the TCM.
8. Connect a test lamp between the signal circuit terminal 6 and ground.
9. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when
changing between the selected states.
瀚慖f the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
瀚慖f the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
10. If all circuits test normal, replace the TCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Brake Pedal Position Sensor Calibration ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM, ECM, or TCM replacement, setup, and
programming
C0298
DTC C0298
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provide an overview of each diagnostic category.
DTC Descriptors
DTC C0298 00
- Park Brake Unlatch Switch Circuit Malfunction
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 module detects the apply or release button was activated for more than 90 seconds.
Action Taken When the DTC Sets
A DIC message and/or a warning indicator may be displayed.
