Principles of Operation

PRINCIPLES OF OPERATION

The power liftgate feature allows the customer to automatically open or close the liftgate by activating the interior open/close switch, the remote keyless entry transmitter, or by manually initiating movement.
The power liftgate uses a power cinching system to latch the liftgate.

The power liftgate system consists of the following components:
- power liftgate control switch (located in the overhead console).
- power liftgate motors (located in the rear headliner area).
- optical sensor (located on the left power liftgate motor assembly).
- pinch strip switches (located on the body above the taillamps).
- cinching latch (located in the middle lower portion of the liftgate).
- forkbolt switch (located in the cinching latch mechanism).
- detent switch (located in the cinching latch mechanism).
- liftgate latch remote control (located in the lower right-hand area of the liftgate).
- home position switch (located on the liftgate latch remote control).
- liftgate latch lock/unlock actuator (located in the lower left-hand area of the liftgate).
- power liftgate module (located behind the left rear quarter trim panel).

The power liftgate is controlled by the power liftgate module.

The power liftgate module receives inputs from:
- glass position switch (determines the ajar status of the liftgate glass).
- forkbolt switch (determines the primary position of tie latch).
- detent switch (determines the secondary position of the latch).
- home switch (determines the power cinch status).
- power liftgate control switch (activates the power liftgate from the interior of vehicle).
- pinch strip switches (determines if an obstacle is between the pinch strip and liftgate).
- instrument cluster module (activates and sets the options for the power liftgate).
- optional sensor (determines the direction, travel speed and obstacle detection of the liftgate).
- UBP serial communication link.
- power deployable running boards (if equipped).

The power liftgate module sends outputs to:
- liftgate motors.
- power cinching latch system.
- liftgate chime module.
- body security module.
- power deployable running boards (if equipped).

The power liftgate may not operate under the following conditions:
- a low voltage or dead battery.
- a disconnected battery.
- a power liftgate that has been left open for more than six hours.
- a power liftgate that has been manually closed and left ajar.

If any of these conditions has occurred, the power liftgate must be reset before performing any pinpoint tests.