Diagnostic Instructions
DTC Descriptors
DTC C1586
Right Park Brake Actuator Circuit
For symptom byte information, refer to: Symptom Byte List
Diagnostic Fault Information
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
Conditions for Setting the DTC
The Electronic Brake Control Module detects a malfunction in the right park brake actuator or its circuits.
Action Taken When the DTC Sets
Conditions for Clearing the DTC
Diagnostic Aids
After repairing any fault, the DTC will still be set as current and the park brakes will not function. It is necessary to clear the DTC with a scan tool in order to place the DTC in history and regain park brake function.
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
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
1. Verify the M104R Park Brake Actuator - Right apply when pulling the S91 Park Brake Switch.
Refer to the Circuit/System Testing.
2. Verify the M104R Park Brake Actuator - Right release when pressing the S91 Park Brake Switch.
Refer to the Circuit/System Testing.
3. All OK.
Circuit/System Testing
NOTE: It is necessary to clear the DTC after any repair is made to regain park brake output control and have the DTC to set as history.
1. Ignition OFF, disconnect the harness connector at the M104R Park Brake Actuator - Right and the harness connector at the K17 Electronic Brake Control Module. Ignition ON.
2. Test for less than 1 V between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:
Repair the short to voltage on the circuit.
3. Ignition OFF.
4. Test for infinite resistance between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:
Repair the short to ground on the circuit.
5. Test for less than 2 Ω between the M104R Park Brake Actuator - Right harness connector terminal 1 and the K17 Electronic Brake Control Module harness connector terminal 2
Repair the open/high resistance in the circuit.
6. Test for less than 2 Ω between the M104R Park Brake Actuator - Right harness connector terminal 2 and the K17 Electronic Brake Control Module harness connector terminal 3
Repair the open/high resistance in the circuit.
7. Install a 25 A fused jumper wire between one of the control terminals at the M104R Park Brake Actuator - Right and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M104R Park Brake Actuator - Right should perform the apply and release function.
Replace the M104R Park Brake Actuator - Right.
8. Replace the K17 Electronic Brake Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.