Description And Operation: Operation

The PLGM contains the electronic circuitry and software used to control the sequence of events for the power liftgate system. This module communicates on the Controller Area Network (CAN) to monitor many different inputs and outputs such as door lock status, transmission gear selector position and vehicle speed.

The power liftgate open/close command can be initiated by either one press of the power liftgate overhead console switch, one press of the power liftgate D-Pillar switch, two presses of the key fob power liftgate button or by the customer executing a valid "kick" under the liftgate signaling the Hands Free Module (HFM) to unlock and open the liftgate. The overhead console and D-Pillar switches are hardwired to the PLGM, whereas the key fob and HFM signal is sent out on the Controller Area Network (CAN) data bus circuit. This signal is detected by the PLGM. The PLGM then interprets the information to confirm safety requirements are met before applying power to the power liftgate motor to start a power cycle.

During a power liftgate open or close cycle, if the PLGM detects sufficient resistance to liftgate travel, such as an obstruction in the liftgate's path, the PLGM will immediately stop liftgate movement and reverse the direction of travel to the full open or closed position.

The PLGM has the ability to relearn. After 8 miles have been recorded on the odometer, anytime the liftgate is fully opened and fully closed using the automatic system, the PLGM will learn from its cycle. If a replacement power liftgate component is installed or a liftgate adjustment is made, the PLGM will relearn the effort and time required to open or close the liftgate. This calibration can be performed with a diagnostic scan tool or with a complete cycle of the liftgate, using any of the command switches. For detailed instructions. Refer to: POWER SLIDING DOOR LEARN CYCLE .

CHIME 

The power liftgate chime can produce either single or repetitive, audible chime tones as an alert heard at the rear of the vehicle at the start of any power liftgate opening or closing cycle.

The chime is completely controlled by and receives both a path to ground and current through hard wired circuits from the PLGM.

The PLGM outputs a Pulse Width Modulated (PWM) signal to drive the chime. When activated in the repetitive mode the chime is pulsed ON and OFF in 0.5 second intervals.