Control module, all-wheel drive (724)
| Control module, all-wheel drive (724) |
| Location |
Control module, all-wheel drive (724)
| Main function |
The function of the control module is to regulate the engagement of the differential clutch, and on cars with limited slip differential clutch its engagement too.
| Type |
Has a microprocessor, see Control module, general description . The software in the control module can be updated with SPS.
| Electrical connections |
K12
| Pin no. | Signal type | Description |
| D | P-BUS | Bus- |
| E | Signal ground | Connected to grounding point G34S |
| F | + 15 | Supplied from fuse 17 in REC |
| K | P-BUS | Bus+ |
| L | Power ground | Connected to grounding point G34P |
| M | +30 | Supplied from fuse 11 in REC |
K4
| Pin no. | Signal type | Description |
| A | Ground | Ground for solenoid valve, limited slip differential clutch |
| B | PWM | Power supply to solenoid valve, limited slip differential clutch |
| C | Ground | Ground for pump motor |
| D | PWM | Power supply to pump motor |
Diagram
| Function |
The XWD control module, abbreviated to RDCM, is connected to the vehicle's P-bus. Its bus messages are used to determine the operating/driving conditions for the vehicle, and accordingly how much drive torque should be transferred to the rear wheels. The control module and control valve are calibrated together, and they must be replaced together without exception.
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