Liftgate Release Switch - Operation

OPERATION

The liftgate release switch is a normally open switch that is connected to ground at all times. When the switch button is depressed, it provides a ground signal to the Body Control Module (BCM) through a liftgate release switch sense circuit. In response to that input, the BCM determines the appropriate response based upon the current status of the power lock system. If the power lock system status is unlocked, the BCM provides a hard wired output to release the liftgate latch. If the power lock system status is locked, the BCM ignores the liftgate release switch input.

The diagnostic resistor integral to the output side of the switch enables the BCM to monitor the condition of the liftgate release switch and switch sense circuit. The BCM will store a Diagnostic Trouble Code (DTC) for any fault that is detected in this circuit.

The hard wired circuits between the liftgate release 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 devices that provide some features of the power lock system. The most reliable, efficient, and accurate means to diagnose the power lock system or the electronic controls and communication related to liftgate release switch operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.