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Originally Posted by SD987
The tire pressure monitoring system (RDK) uses a 433 mhz radio transmitter to relay pressures from each of the four wheels to a processor, which is then integrated into the display. I assume it can be checked using the OBC stalk control.
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Interesting our 2006 BMW 530i tire pressure monitoring system monitors the
RPMs of each of the four wheels. When one of the wheel's rpms drops due to a change in rolling radius (relative to the others), it indicates a tire pressure drop and the alarm light comes on.
This is a very practical method for monitoring tire pressure
change since RPMs at each wheel are monitored anyway for ABS.
Surprised other mfgrs do this any differently.
Best regards,
Gordie
Austin, TX