RDC control unit: Notes

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.

Fig 1: Identifying RDC Control Unit, Holder, 4-Pin Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	4-pin plug connection
2	RDC control unit
1	Holder