Passive Entry System

WARNING: This page is about a different car, the 2015 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

In the Passive Entry (PE) 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 handle. When the system senses a hand approaching the capacitive switch in the door handle pull or detects a button press of the deck lid 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 Ultra High Frequency (UHF) message back to the receiver within the Radio Frequency Hub Module (RFHM). If the RFHM determines the FOBIK is valid and that it is located outside the vehicle in the same zone or vicinity as the door handle or deck lid switch being activated, it sends an electronic Unlock Request message over the Controller Area Network (CAN) data bus to the Body Control Module (BCM) to automatically unlock and allow entry to that aperture.

The PE system circuits and FOBIK inputs are continually monitored by the microcontroller and software contained within the RFHM. When the RFHM monitors a problem in any of the PE system circuits or FOBIK inputs, it stores a Diagnostic Trouble Code (DTC) in its memory circuit. The hard wired circuits between components related to the PE system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, 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 PE system or the electronic controls or communication between other modules and devices that provide features of the PE system. The most reliable, efficient, and accurate means to diagnose the PE system or the electronic controls and communication related to PE 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.