RDC control unit

At the request of the RDC control unit, the following messages are queried via the RDC transmitters (125 kHz) by each wheel electronics system:

• Tire pressure
• Tire air temperature
• Battery status and identifier (ID) of the wheel electronics system

These messages are then sent across a high-frequency transmission path (433 MHz) to the RDC aerial. The measuring cycle is 54 seconds. The received radio signal are converted into a digital signal in the RDC aerial. This digital signal is forwarded on the bus to the RDC control unit.

Fig 1: Identifying RDC Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.