Overhead Console Switch - Operation

OPERATION

The front power liftgate switch (also known as the overhead console switch) is a momentary, push button actuated, resistor multiplexed switch. The switch has a path to ground at all times through an eyelet terminal secured by a screw to the body sheet metal within the passenger compartment. The switch provides a multiplexed output to the PLGM on a liftgate switch front signal circuit. The PLGM reads the switch output through an internal pull up. The output to the PLGM indicates whether the switch push button is depressed or released.

When the switch push button is depressed, it provides an Open or a Close request to the PLGM. The PLGM interprets the request based upon the present status of the liftgate. If the monitored status of the liftgate is not closed, the front switch input is interpreted as a Close request. If the status of the liftgate is not opened, the front switch input is interpreted as an Open request. If the switch button is depressed a second time, while the PLGM is in the process of opening or closing the liftgate, the PLGM will automatically reverse the liftgate to the full open position.

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