Keyless Entry: Description and Operation

The Keyless Entry feature allows the owner to operate several vehicle features from outside of the vehicle using a hand-held radio transmitter. The transmitter sends coded signals to the Remote Function Actuator (RFA) Module. The RFA Module receives and decodes the signals then, by Class 2 serial data communications, request the Body Control Module (PZM) to command the power door locks, theft deterrent and release systems to the desired state.

Power is provided from the COMFORT fuse in the Trunk Compartment Fuse Block, on CKT 2640 (ORN) to terminal "A" of the Remote Function Actuator (RFA) Module. The (RFA) module is grounded at terminal "C" through CKT 1051 (BLK) to ground G400. When the RFA module issues a message, to lock doors, open the trunk lid, etc., it is sent via Class 2 serial data to the Body Control Module (PZM), which commands the appropriate systems. Refer to descriptions of circuits controlled by the PZM.