Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
RDC control unit
The RDC control unit processes the messages sent by the wheel electronics. Above a speed of 20 - 30 km/h, the following messages are sent by the electronics on each wheel:
- Tire pressure
- Tire air temperature
- Remaining service life of the battery
- Data from the acceleration sensor and Identification Feature (ID) of the wheel electronics
These messages are then transmitted directly to the RDC control unit via a high-frequency transmission path (433 MHz), where they are then evaluated. The measuring cycle of the wheel electronics amounts to 3 second, with transmission to the RDC control unit taking place every 30 seconds. The current status of the messages is sent to the CAN bus (body CAN) and is then rendered visible by the indicating instruments. The installation location for the RDC control unit is in the outer area on the vehicle underbody behind the rear axle.
| Item | Explanation |
|---|---|
| 1 | 4-pin plug connection |
| 2 | RDC control unit |
| 1 | Holder |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.