Contents: Internal structure of the parking…⇩ Inputs and outputs ⇩ Parking Brake Control Unit Connector…⇩ Parking Brake Control Unit Connector…⇩
The parking brake control unit monitors external and internal input signals and adjusts the brake cable tension to control the operation of the drum brakes according to the required parking brake operation.
The parking brake control unit is mounted on a support bracket attached to the front of the spare tire carrier. Two rubber mounts mounted on brackets at the bottom of the parking brake control unit fit into holes in the support bracket. The upper corners of the parking brake control unit are secured to the support bracket with rubber mounts and flange nuts.
Main components and parts of the parking brake control unit:
- Printed circuit board with ASIC (specialized integrated circuit), which provides control of the parking brake.
- Electric motor.
- Reducer.
- Splined shaft.
- Force sensor.
The spline shaft and the force sensor are connected by a lock at the end of the spline shaft. The spline shaft rotates on the lock and moves axially in the gearbox. The lock and the force sensor move in the channel of the parking brake control unit housing.
To engage and disengage the drum brakes, the parking brake control unit turns on an electric motor, which drives a gearbox. The gearbox turns a splined shaft, increasing or decreasing the tension of the brake cables. The parking brake control unit monitors the load applied to the brake cables using a signal from the force sensor.
Internal structure of the parking brake control unit
| Item name | Spare part catalog number | Description |
| 1 | Electrical connector | |
| 2 | Frame | |
| 3 | Electric motor | |
| 4 | PCB | |
| 5 | Splined shaft | |
| 6 | Reducer | |
| 7 | Force sensor |
Inputs and outputs
On the RH (right) side of the parking brake control unit there is a 32-pin connector that provides a connection between the printed circuit board and the vehicle's electrical wiring.
Power is supplied to the parking brake control unit via two permanent lines from the BJB (battery Distribution Box). Two other connections with CJB (central electrical distribution box) are designed to transmit voltage signals when the key is inserted into the ignition switch and when the key is in position II (ignition on). Other permanent wiring connections are provided to carry signals from the parking brake switch and, for manual transmission models, the clutch pedal position sensor signal.
In addition to permanent wire connections, the parking brake control unit is connected to a high-speed CAN bus. (controller network) to exchange data with other vehicle systems.
Parking Brake Control Unit Connector C2178
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Parking Brake Control Unit Connector Pins C2178
| Contact No. | Description | Login/Logout |
| A1 | Not used | - |
| A2 | High Speed CAN Bus Low Level Output (controller network) | Login/Logout |
| A3 | High Speed CAN Bus High Level Input (controller network) | Login/Logout |
| A4 | High Speed CAN Bus Low Input (controller network) | Login/Logout |
| B1 | Not used | - |
| B2 | High-speed CAN bus high level output (controller network) | Login/Logout |
| B3 | Parking brake switch SW1 | Entrance |
| B4 | Parking brake switch SW4 | Entrance |
| C1 and C2 | Not used | - |
| C3 | Parking brake switch SW2 | Entrance |
| C4 | Parking brake switch SW5 | Exit |
| D1 - E1 | Not used | - |
| E2 | Clutch Pedal Position Sensor Ground | Entrance |
| E3 | Clutch Pedal Position Sensor Signal | Entrance |
| E4 | Power supply for the clutch pedal position sensor | Exit |
| F1 | Not used | - |
| F2 | The key is in the ignition | Entrance |
| F3 | Ignition supply | Entrance |
| F4 | Red parking brake indicator | Exit |
| G1 | Not used | - |
| G2 | Weight | Exit |
| G3 | Not used | - |
| G4 | Powered by battery | Entrance |
| H1 | Not used | - |
| H2 | Weight | Exit |
| H3 | Not used | - |
| H4 | Powered by battery | Entrance |
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