All of the doors lock or unlock in unison when a door lock and side window switch is activated in the power door lock system. The door locks are operated by reversible actuators that receive voltage from the door lock relay. The door lock relay provides power or ground to one side of the door lock actuators.

The door unlock relay controls the passenger side door lock actuator. The drivers door unlock relay controls the driver door lock actuator.

The body control module (BCM) controls the ground to the driver door unlock relay. Inputs from CKT 294 (TAN) and CKT 295 (GRY) to the BCM are used in order to control the driver door unlock relay.

Press the door lock and side window switch in order to provide battery voltage to the door lock relay. The door lock relay is energized and voltage is supplied to the door lock actuators. The ground for the passenger side door lock actuator is provided through the door unlock relay. The ground for the driver side door is provided through the driver door unlock relay.

Press the door lock and side window switch in order to provide battery voltage to the coil side of the door unlock relay and the BCM. This supplies voltage to the passenger door lock actuator. The BCM will ground the driver door unlock relay in order to provide power to the driver door lock actuator. Ground to both actuators is provided through the door lock relay.

With remote keyless entry, the BCM will receive an input from the RFA module. The BCM can control both locking and unlocking of the doors. Software in the BCM allows the RKE to unlock only the driver door with one press of the button. The RKE unlocks both doors when the button is pressed twice.

The motor is protected by a built-in electronic circuit breaker (ECB). If the motor is overloaded or voltage is applied for an excessive amount of time, the ECB internal resistance increases, essentially creating an open circuit. The resistance returns to normal only after voltage is removed from the circuit, thereby restoring circuit continuity.