Buick Regal: DTC C1587
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 C1587
Left Park Brake Actuator
For symptom byte information, refer to: Symptom Byte List
Circuit/System Description
The Electronic Brake Control Module will diagnose the park brake motor
circuits to verify that they are
functioning properly. The park brake motor circuits are used to command actuator
motor operation,
which will apply and release the parking brake. These circuits are used to
activate the actuator, which
applies or releases pressure on the rear caliper pistons, ultimately applying
and releasing the park brake.
When the Park Brake Switch is pulled, a signal is sent to the Electronic Brake
Control Module which
will supply 12 V to the apply control circuits and ground to the release control
circuits which will cause
the left and right park brake actuators to activate causing the park brakes to
engage. When the Park
Brake Switch is pressed, a signal is sent to the Electronic Brake Control Module
which will supply 12 V
to the released control circuits and ground to the apply control circuits which
will cause the left and right
park brake actuators to activate causing the park brakes to release.
Conditions for Running the DTC
- Ignition OFF, ACCESSORY, or RUN mode.
- Battery voltage is between 9 - 16 V
Conditions for Setting the DTC
The Electronic Brake Control Module detects a malfunction in the left park
brake actuator.
Action Taken When the DTC Sets
- The parking brake is disabled, one release allowed.
- A message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
- The Electronic Brake Control Module will clear the DTC after 40
consecutive ignition on/off
cycles with at least one test pass in each ignition cycle and no test fail
result.
- The condition for the DTC is no longer present.
Reference Information
Schematic Reference
Park Brake System Wiring Schematics
Connector End View Reference
COMPONENT CONNECTOR END VIEW INDEX
Description and Operation
Electronic Parking Brake 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
1. Ignition ON.
2. Verify that DTC C1587 is not set.
- Perform the Park Brake Calibration learn procedure. Refer to Park Brake
Calibration.
- Ignition ON.
- Apply and release the park brake.
- Verify the DTC is not set.
- If the DTC is set, replace the M104L Park Brake Actuator - Left.
- Go to next step: If the DTC is not set
- All OK.
- Go to next step: If the DTC is not set
3. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Parking Brake Actuator Replacement (GNC)Parking Brake Actuator
Replacement (GNQ)
- Control Module References for control module replacement, programming
and setup
READ NEXT:
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.
Diag
The park brakes do not require calibration often. Park brake calibration may
be required after certain
service procedures are performed. Some of these procedures are as follows:
Park brake actuator
SEE MORE:
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
D
Preliminary Procedure
1. Recover the refrigerant.
2. Radiator Air Lower Baffle Replacement.
Air Conditioning Receiver and Dehydrator Plug
Air Conditioning Receiver and Dehydrator Plug Retaining Ring
Air Conditioning Receiver and Dehydrator
AIR CONDITIONING EVAPORATOR THERMAL EXPANSION VALVE R