Passive Entry System

In the Passive Entry Keyless Go (PEKG) system the doors are unlocked passively; however, they must still be locked actively after exiting the vehicle using the tactile Lock  button on either front door Smart handle. When the system senses a hand approaching the capacitive switch in the door Smart handle pull or detects a button press of the liftgate release switch, it sends out challenge messages through the Low Frequency (LF) antennas to authenticate the presence and location of a valid FOB with Integrated Key (FOBIK).

The FOBIK responds by sending a Very High Frequency (VHF) message back to the receiver within the Radio Frequency Hub (RFH). If the RFH determines the FOBIK is valid and that it is located outside the vehicle in the same zone or vicinity as the door handle or liftgate switch being activated, it sends an electronic Unlock Request  message over the CAN bus to the BCM to automatically unlock and allow entry to that aperture.

The PEKG system circuits and FOBIK inputs are continually monitored by the microcontroller and software contained within the RFH. When the RFH monitors a problem in any of the PEKG system circuits or FOBIK inputs, it stores a DTC in its memory circuit. The hardwired circuits between components related to the PEKG system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes appropriate SYSTEM WIRING DIAGRAMS, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the PEKG system or the electronic controls or communication between other modules and devices that provide features of the PEKG system. The most reliable, efficient, and accurate means to diagnose the PEKG system or the electronic controls and communication related to PEKG system operation, as well as the retrieval or erasure of a DTC requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.