The power door lock system consists of the following components:

The power door lock system can be controlled by any of the following:

When any of the door lock switches are placed in the lock position, voltage is applied to the door lock control circuit and the lock relay winding. Since the other side of the lock relay winding is connected to ground, the relay is energized. This causes the contacts to close and complete the path from the PWR ACCY fuse through the battery voltage circuit. Voltage is then applied to the door lock motor lock circuit to the lock side of the door lock actuators. Since the other side of the all the door lock actuators are connected through the door lock motor unlock circuit to the normally closed contacts of the unlock relay to ground , the doors lock.

On vehicles equipped with keyless entry, the passenger and rear door lock actuators lock in the same manner as described above, however, the driver and the rear door lock actuators have the door lock motor unlock circuit connected to the remote control door lock receiver. The remote control door lock receiver internally grounds the driver door lock actuator and also provides a pass through circuit for the rear door lock actuator to the door lock motor unlock circuit and then to normally closed contacts of the unlock relay to ground.

When any of the door lock switches are placed in the unlock position, voltage is applied to the door unlock control circuit and the unlock relay winding. Since the other side of the unlock relay winding is connected to ground, the relay is energized. This causes the contacts to close and complete the path from the PWR ACCY fuse through the battery voltage circuit. Voltage is then applied to the door lock motor unlock circuit to the unlock side of the door lock actuators. Since the other side of the door lock actuators are connected through the door lock motor lock circuit to the normally closed contacts of the lock relay to ground, the doors unlock.

On vehicles equipped with keyless entry, the passenger and rear door lock actuators unlock in the same manner as described above, however, the driver and the rear door lock actuators have the door lock motor unlock circuit connected to the remote control door lock receiver. The remote control door lock receiver monitors the door unlock control circuit and when it senses a unlock switch activation it internally switches the driver door unlock control circuit to battery voltage. This is done so that these doors can be unlocked separately using the keyless entry transmitter. So, the unlock function of these door lock actuators differ from the passenger and side door lock actuators.

The power door lock control module, controls the activation of the side door lock actuator. With the side door open, actuation of a door lock switch to the lock position locks the front doors and the rear door immediately. However, the side door lock actuator does not operate, because the contacts at the side door contact plate are open. When the power door lock control module senses an active state on the side door jamb switch signal circuit (side door open) a delay lock function is activated. When the door lock control module senses an inactive state on the side door jamb switch signal circuit (side door closed) the door lock control module starts a timer which, after approximately 5 seconds, produces another lock command. This additional lock command cycles the door lock relay to lock all the doors.

If during the 5 second delay, the side door reopens, the power door lock control module remains enabled. The power door lock control module again waits for closure of the side door. The side door will lock 5 seconds after the side door closes. If, during the timing process, the module receives a command for unlocking all of the doors, both the logic and the timer reset. The side door does not lock, even when the door is already closed.