Power Door Locks

The Power Door Locks are operated by reversible Motors located in each front door, the Side Door and the Rear Door. Voltage to the Door Locks is supplied through the PWR ACCY Circuit Breaker.

Moving either Power Door Lock Switch, mounted in the Front Doors, to LOCK applies voltage to cavity F of the Door Lock Relay. This energizes the Lock Coil in the Relay and current flows directly to both Front Door Locks, Side Door Lock, and Rear Door Lock through the GRY (295) wire then to the Motors. Ground for the Motors is provided through the TAN (246/294) wire and the normally closed contacts of the UNLOCK contacts of the Door Lock Relay.

Moving one of the Door Lock Switches to UNLOCK reverses the polarity of the system. Current flows through the energized UNLOCK Relay contacts and ground is provided through the LOCK relay contacts.

If the Side Door is open, a ground signal from the Side Door Jamb Switch is sent to the Door Lock Control Module. If the Door Lock Switch is moved to LOCK while the Side Door is open, the two front doors and Rear Doors are locked and a LOCK signal is sent to the Door Lock Control Module at cavity F.

When the Side Door is closed, the Door Jamb Switch opens, breaking the ground signal to the Door Lock Control Module. This starts a 5-second timer in the Module. After 5 seconds, voltage is supplied to the Door Lock Relay from cavity C of the Door Lock Control Module. This energizes the Door Lock Relay, sending voltage to the Door Lock Motors to lock the side door.

This time, if the Side Door is reopened within this 5 seconds, the 5 second timer is reset and Locking Pulse will take place at the end of this 5 seconds. Unlocking the Doors resets the 5-second timer in the Door Lock Control Module.

The Door Lock System must be unlocked using the LH Power Door Lock Switch or RH Power Door Lock Switch. On cargo door equipped vehicles, once the door lock system is unlocked the cargo door handle is used to mechanically open the door. On vehicles equipped with a liftgate, the Liftgate Lock/Unlock Release Switch (Mechanical Key) is added to serve the same function as the front power door lock switches, lock and unlock all doors including liftgate. Once the door lock system is unlocked, the liftgate release switch must be pressed to electrically open the liftgate while the handle is pulled to release the secondary latch.