Component Description

Body Closures

Component Description

Power Liftgate Switch - Instrument Panel

The instrument panel power liftgate switch is a momentary contact switch that supplies a ground signal to the LTM (Liftgate/Trunk Module) when it is pressed. Pressing this switch either opens, closes or stops the power liftgate depending upon the conditions.

Power Liftgate Switch - Rear

The rear power liftgate switch is a momentary contact switch that supplies a ground signal to the LTM (Liftgate/Trunk Module) when it is pressed. Pressing this switch closes the power liftgate depending upon the conditions.

Power Liftgate Switch - Exterior

The exterior power liftgate switch is a momentary contact switch that supplies a ground signal to either the BCM (Body Control Module) (without IA (Intelligent Access)) or the RFA (Remote Function Actuator) module (with IA (Intelligent Access)).

Without IA (Intelligent Access)

When the exterior liftgate switch is pressed, the BCM (Body Control Module) sends a signal to the LTM (Liftgate/Trunk Module) over a hardwired circuit which opens the liftgate only when the doors are unlocked.

With IA (Intelligent Access)

When the exterior liftgate switch is pressed, the RFA (Remote Function Actuator) module activates the power liftgate IA (Intelligent Access) feature. If the conditions allow, the RFA (Remote Function Actuator) module sends a signal over the MS-CAN (Medium Speed Controller Area Network) to the LTM (Liftgate/Trunk Module) which opens the liftgate.

Pinch Strip Switch

The power liftgate pinch strips are membrane style switches. When the switch is pressed the contacts inside the switch make contact and send a ground signal to the LTM (Liftgate/Trunk Module) indicating that there is an obstacle preventing the liftgate from closing. When the pinch strip is not pressed, it has an approximate resistance of 2500-10,500 ohms.

Power Liftgate Chime

The power liftgate chime provides audible warnings to the operator. It is mounted on the LTM (Liftgate/Trunk Module) and is not serviceable separately.

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 (3.11 mi)
- the ignition is in RUN or the transmission is not in park
- the battery voltage is low

Power Liftgate Latch

The power liftgate latch is responsible for latching, unlatching, and cinching the liftgate. The power liftgate latch contains the unlatch/cinching motor, detent switch, forkbolt primary and secondary switches, and the sector gear switches.

Unlatch/Cinching Motor

The latch uses a bi-directional motor to accomplish both unlatch and cinch operations. The motor is driven in one direction to cinch and in the opposite direction to unlatch. During a cinch operation, power is supplied to the unlatch/cinching motor by the LTM (Liftgate/Trunk Module) when the secondary latch position is reached during a power close operation. When the motor activates, it pulls the liftgate into the primary latch position. The LTM (Liftgate/Trunk Module) removes power from the unlatch/cinching motor when the primary latch position is reached. During an unlatch operation, power is supplied to the unlatch/cinching motor by the LTM (Liftgate/Trunk Module) when a valid open command is received.

Power Liftgate Detent Switch, Forkbolt Primary Switch and Forkbolt Secondary Switch

The power liftgate detent switch, forkbolt primary switch and forkbolt secondary switch provide inputs to the LTM (Liftgate/Trunk Module) to determine liftgate latch position. The liftgate is in the primary position when the liftgate is in the full closed position. The liftgate is in the unlatch position when the liftgate is open and completely out of the striker. The LTM (Liftgate/Trunk Module) receives inputs from the power liftgate detent switch, forkbolt primary switch and forkbolt secondary switch in the following manner: NOTE:The detent switch may be in an open or grounded state depending on forkbolt position. The detent switch state only changes as the forkbolt rotates.






Sector Gear Switches

The sector gear open and close switches provide input to the LTM (Liftgate/Trunk Module) to determine the position of the sector gear. The sector gear is part of the latch assembly. It is driven by the latch motor and in turn drives the latch mechanism. During a release operation, the LTM (Liftgate/Trunk Module) deactivates the unlatch/cinching motor once the end of travel is reached. After a release operation, the LTM (Liftgate/Trunk Module) keeps the latch released until the gate moves away from the vehicle. The LTM (Liftgate/Trunk Module) then reverses the direction of the unlatch/cinching motor until the sector gear switches indicate the sector gear has returned to the neutral position. Refer to the following table for sector gear switch states:






Power Liftgate Motor

The power liftgate motor is responsible for raising and lowering the liftgate. The power liftgate motor is a bi-directional motor and contains a position sensor that provides input back to the LTM (Liftgate/Trunk Module) for liftgate position and velocity.

Position Sensor

The LTM (Liftgate/Trunk Module) supplies a 5-volt reference voltage to the position sensor on a valid open command or anytime the liftgate is in the open position (up to 6 hours). The LTM (Liftgate/Trunk Module) constantly supplies the ground. The position sensor has 2 data lines that the LTM (Liftgate/Trunk Module) monitors to determine liftgate movement and position. The LTM (Liftgate/Trunk Module) uses the liftgate position information to determine which direction to power the liftgate (open or close) when a valid operation command is received. The movement is monitored to identify obstructions.

Liftgate Or Trunk Module (LTM)

The LTM (Liftgate/Trunk Module) is responsible for opening or closing the power liftgate based on the inputs it receives. Based on the inputs, it determines if conditions allow a power open or power close.

The BCM (Body Control Module) supplies battery logic power required for the software and internal switching operations. Power is supplied to the motor and latch by BJB (Battery Junction Box). Ground for the LTM (Liftgate/Trunk Module) is a separate single connection. Some of the continuous inputs which are at a ground state when on, are also used for logic switching.

The LTM (Liftgate/Trunk Module) does not require PMI (Programmable Module Installation) when it is replaced.