Body Control Module (BCM)

The BCM is responsible for checking the identifications from both the RFA module and the PCM. It also controls the ignition states and determines if the engine should be started or turned off depending upon input from the start/stop and brake switches and if a programmed IA key is inside the vehicle. The RFA module sends a MS-CAN  message to the BCM indicating if a programmed IA key is inside the vehicle.

If the BCM is replaced, the two parameter reset procedures must be performed to enable PATS. The two parameter reset procedures are between the BCM and RFA module, and the BCM and PCM.