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, the BCM receives a switched ground signal. The BCM then supplies ground to the door lock relay control circuit and the lock relay winding. Since the other side of the lock relay winding is connected to battery positive voltage through the LOCKS fuse, the relay is energized. This causes the contacts to close and complete the path from the LOCKS fuse through the battery voltage circuit. Voltage is then applied to the lock side of the door lock actuators. Since the other side of the passenger door lock actuator is connected to the normally closed contacts of the unlock relay to ground and the driver door lock actuator is connected to the normally closed contacts of the driver door unlock relay to ground, the doors lock.

The lock function can also be accomplished by the BCM supplying ground to the door lock relay control circuit by any of the following:

When any of the door lock switches are placed in the unlock position, the BCM receives a switched ground signal. The BCM then supplies ground to the door unlock relay control circuit and the unlock relay winding. Since the other side of the unlock relay winding is connected to battery positive voltage through the LOCKS fuse, the relay is energized. This causes the contacts to close and complete the path from the LOCKS fuse through the battery voltage circuit. Voltage is then applied to the unlock side of the door lock actuators. Since the other side of the passenger door lock actuator is connected to the normally closed contacts of the lock relay to ground, the passenger door unlocks.

The unlock function can also be accomplished by the BCM supplying ground to the door unlock relay control circuit by any of the following:

When any of the door lock switches are placed in the unlock position, the BCM receives a switched ground signal. The BCM then supplies ground to the driver door unlock relay control circuit and the unlock relay winding. Since the other side of the unlock relay winding is connected to battery positive voltage through the LOCKS fuse, the relay is energized. This causes the contacts to close and complete the path from the LOCKS fuse through the battery voltage circuit. Voltage is then applied to the unlock side of the driver door lock actuator. Since the other side of the driver door lock actuator is connected to the normally closed contacts of the lock relay to ground, the driver door unlocks.

The unlock function can also be accomplished by the BCM supplying ground to the door unlock relay control circuit by any of the following:

This feature prevents the locking of the driver door if the ignition key is left in the ignition lock cylinder. If a lock function occurs from any door lock switch and the BCM senses an active state on either the left front door latch signal or the secondary door latch switch signal and the key in ignition switch signal circuit is in the yes state, the BCM will cycle the door lock relay to lock the doors and then cycle the driver door unlock relay to unlock the driver door.

The automatic door lock feature can be programmed to control the door lock system. The automatic door lock feature is factory programmed to have all doors lock and unlock. For detailed instructions on programming the automatic door locks, refer to Vehicle Personalization in Personalization.

When the automatic door lock feature is programmed to control the door lock system, the BCM will lock the vehicle doors if the following inputs are true:

This automatic door lock function will only occur once per ignition cycle unless, a door jamb switch input changes state to active and back to inactive. Then the BCM will lock all doors again.

Once the automatic door lock feature has locked the doors, the BCM will then unlock all the doors when the transmission is shifted into PARK.