Trunk / Liftgate: Description and Operation
Body Closures
The power liftgate feature allows the customer to open or close the liftgate by operating any of the following:
- instrument panel control switch
- the liftgate button on a Remote Keyless Entry (RKE) transmitter
- exterior liftgate switch (open only)
- rear quarter trim-mounted switch (close only)
The power liftgate uses a power cinching system to latch the liftgate.
For vehicles without Intelligent Access (IA), unlock the doors to open the power liftgate from the exterior liftgate release switch. For vehicles with IA (Intelligent Access) an IA (Intelligent Access) key must be near the liftgate for the liftgate to open. Refer to Doors, Hood and Trunk &/or Locks for information on the IA (Intelligent Access) liftgate feature.
Power liftgate operation requires the vehicle to be in park and the vehicle speed to be less than 5 km/h (3 mph).
The power liftgate can be manually opened due to power latch loss of function. Refer to Liftgate Latch Manual Release in Doors, Hood and Trunk &/or Locks for additional information.
The power liftgate feature suspends a power open or power close when the ignition is placed in the START position. The motor holds the liftgate in place during a start operation. Once the ignition is no longer in the START position, the liftgate power open or power close resumes. If the ignition state changes during a power close and the liftgate is 15 to 24 cm (6 to 10 in) from being latched, the liftgate may reverse to the full open position.
The power liftgate feature can be enabled/disabled from the message center. When the power liftgate feature is disabled (off), operation from the exterior liftgate switch and liftgate rear control switch are disabled (instrument panel mounted power liftgate control switch and RKE (Remote Keyless Entry) transmitter operation remain active).
The power liftgate system consists of the following components:
- power liftgate control switch (located in the instrument panel)
- power liftgate rear control switch (located in the lh rear quarter trim panel)
- exterior liftgate switch
- power liftgate motor (located behind the lh rear quarter trim panel)
- position sensor (located in the power liftgate motor assembly)
- pinch strip switches (located on the body above the left and right taillamps)
- power liftgate latch (located in the middle lower portion of the liftgate)
- forkbolt switches (located in the power liftgate latch)
- sector gear switches (located in the power liftgate latch)
- detent switch (located in the power liftgate latch)
- unlatch/cinching motor (located in the power liftgate latch)
- liftgate chime (located on the Liftgate/Trunk Module (LTM))
- LTM (Liftgate/Trunk Module) (located behind the left rear quarter trim panel)
The power liftgate is controlled by the LTM (Liftgate/Trunk Module).
The LTM (Liftgate/Trunk Module) receives inputs from the following components:
- forkbolt switch- primary (determines the position of the latch)
- forkbolt switch- secondary (determines the position of the latch)
- sector gear open switch- open (determines the sector gear position)
- sector gear close switch- close (determines the sector gear position)
- Body Control Module (BCM) or Remote Function Actuator (RFA) module (exterior liftgate switch)
- detent switch (determines the position of the latch)
- power liftgate control switch (located in the instrument panel)
- power liftgate rear control switch (located in the lh rear quarter trim panel)
- pinch strip switches (determines if an obstacle is between the pinch strip and liftgate)
- position sensor (determines the direction, travel speed and obstacle detection of the liftgate)
- Medium Speed Controller Area Network (MS-CAN)
The LTM (Liftgate/Trunk Module) sends outputs to the following components:
- liftgate motor
- unlatch/cinching motor
- liftgate chime
- BCM (Body Control Module) (ajar status)
The power liftgate feature sounds an audible chime for 3 seconds whenever:
- the liftgate is requested to begin power closing
- the liftgate reverses to power opening due to an obstacle
- the liftgate stops opening due to an obstacle
The power liftgate feature sounds an audible chime for 1 second whenever there is an open/close request and:
- the vehicle speed is above 5 km/h (3 mph)
- the ignition is in RUN or the transmission is not in park
- the battery voltage is low
The power liftgate may not operate under the following conditions:
- low voltage or dead battery
- disconnected battery
- power liftgate that has been manually closed and left ajar
If any of these conditions have occurred, reinitialize the power liftgate before carrying out any pinpoint tests. Refer to Power Liftgate Initialization .