Trunk / Liftgate: Description and Operation

CIRCUIT OPERATION

The Hatch Pull-Down Release Unit has three modes of operation:


EXTEND AND RELEASE

When the Hatch Release Switch is pressed momentarily, the Unit extends and consequently releases the Hatch.


RELEASE AND EXTEND

Whenever the Hatch is released manually with a key, the unit extends to be ready for Pulldown operation.


PULL-DOWN

When the Hatch is pushed down manually into the Latch, the Hatch is pulled down.


1. EXTEND AND RELEASE OPERATION

When the Hatch Release Switch is pressed, it supplies a ground path to the Hatch Release Relay on CKT 1342. With the Release Relay energized, battery voltage is applied from the ACC Fuse, and CKT 40 to CKT 142. Battery voltage is applied at all times to CKT 138 from the LID Fuse. The Extend Relay is initially energized from CKT 142. Once energized, the battery voltage at terminal "5" of the Extend Relay will continue to energize the Relay. With voltage applied to the Connector Switch Assembly at connector C1 terminal "D" and ground supplied to terminal "A", the motor will be energized. With the Motor energized, positive at terminal "F" and negative at terminal "G", the Hatch Pulldown/release Unit will extend upward.
While extending upward, a deflector on the back side of the Unit mechanically releases the Latch, allowing the Hatch to raise and the Latch Switch to move to the "UNLATCHED" position. The unit stops when the "T" Lever on the Connector Switch Assembly is mechanically toggled. The ground CKT 151 to the Extend Relay is opened and the Extend Relay de-energizes.


2. RELEASE AND EXTEND OPERATION

When the Hatch is released manually with a key, the Hatch raises and the Latch Switch toggles to the "UNLATCHED" position. When this happens, battery voltage present at the Connector Switch Assembly connector C1 terminal "E" from CKT 138, is applied to the Motor at terminal "F" through CKT 142 and connector C1 terminal "D". With the Extend Relay and the Motor now energized, the system will operate the same as if the Hatch Release Switch had been pressed. Refer to #1 operation.


3. PULL-DOWN OPERATION

When the Hatch is pushed down manually into the Latch, the Latch Switch is moved to the "LATCHED" position. Battery voltage from the LID Fuse and CKT 138 is applied at all times to the Connector Switch Assembly at connector C1 terminal "E". With the Latch Switch in the "LATCHED" position and the "T" Lever in the "UP" position, battery voltage is applied to the Motor at terminal "G" from the Latch Switch BLK/YEL wire to connector C2 terminal "C". Ground is supplied to the Motor at terminal "F" from terminal "A" of connector C1.

With battery voltage to the Motor terminal "G", the Hatch Pulldown/Release Unit will pull down and stop only when the "T" Lever is mechanically toggled to the "DOWN" position.

If the Hatch is pushed down before the Hatch Pull-Down Unit has fully extended, the Extend Relay will hold power to the Motor until the extend operation has completed. This will allow for normal Pull-Down operation to occur immediately after.