Pinpoint Test D: The Parking Brake Does Not Hold The Vehicle, Does Not Apply, Does Not Release Using The Automatic Release Function: Notes
Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.
Normal Operation and Fault Conditions
When the ABS module receives a parking brake apply or release request, the ABS module sends voltage to the parking brake actuator motors. The ABS module also monitors the current draw of the actuator motors to determine when the brake pads contact the brake disc, to determine when the appropriate amount of clamping force is being applied to the brake disc and to determine when the brake pads are retracted to their start position. An FD-CAN issue or concern results in a failure to release the parking brake. The ABS module runs self-tests before, during and after an apply or release request. These self-tests are done to determine parking brake system functionality. High actuator motor circuit resistance, a short to ground, a short to voltage, an open circuit, a mechanical or electrical failure of the actuator motor or an internal failure of the ABS module may cause one or more of these self-tests to fail resulting in the ABS module setting one or more Diagnostic Trouble Codes (DTCs). The actuator motors have a serviceable jumper harness connecting the actuator motor to the body harness at C422.
REFER to: Parking Brake - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS C1A43:98 | Motor Supply: Component Or System Over Temperature | This DTC sets when the temperature of the ABS module Field Effect Transistor reaches a preset limit. |
| ABS C2005:18 | Right Actuator: Circuit Current Below Threshold | This DTC sets in continuous memory and on-demand if the ABS module detects current is decreased to fast after start of parking brake release. |
| ABS C2005:19 | Right Actuator: Circuit Current Above Threshold | This DTC sets in continuous memory and on-demand if the ABS module detects high current during apply of parking brake. |
| ABS C2006:18 | Left Actuator: Circuit Current Below Threshold | This DTC sets in continuous memory and on-demand if the ABS module detects current is decreased too fast after start of parking brake release. |
| ABS C2006:19 | Left Actuator: Circuit Current Above Threshold | This DTC sets in continuous memory and on-demand if the ABS module detects high current during apply of parking brake. |
Possible Sources
- Automatic release functional requirements not met
- BCM concern
- PCM concern
- Wiring, terminals or connectors
- Brake caliper
- Parking brake actuator motor
- ABS module
- EPB switch