Switch, Liftgate Release: Operation

The Passive Entry (PE) liftgate lock and unlock switch is a normally open switch that is hardwired to the Body Control Module (BCM) through a signal circuit and a return circuit. The BCM continually monitors the condition of the PE liftgate lock and unlock switch and circuits, and will store a Diagnostic Trouble Code (DTC) for any fault that is detected in these circuits.

When the switch button is depressed, it provides a signal to the BCM. The BCM determines the system response based upon the inputs it receives through the authentication process with each detected FOB with Integrated Key (FOBIK). If the authentication process is successful, the BCM sends an electronic lock request  or unlock request  message to the BCM over the Controller Area Network (CAN) bus, and the BCM energizes the liftgate lock and unlock relay accordingly.

The hardwired circuits between the PE liftgate lock and unlock switch and the BCM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the switch or the electronic controls and communication between other modules and devices that provide some 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 liftgate lock and unlock switch operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.