Power Locks: Description and Operation

Circuit Description

Battery voltage is applied at all times to the door lock control module. When locking the vehicle by using the door lock switch in the power window main switch, a ground is provided to the door lock relay and the doors lock. Locking the doors by using the vehicle key or pushing down the lock knob, will send a signal to the ETACM. The ETACM will then ground the relay and the doors lock.

When you turn the door lock switch in the power window main switch to the UNLOCK position, a path to ground is supplied to the unlock relay. Battery voltage is applied to the door lock actuators.

The polarity of the voltage applied to the actuators is now reversed and the doors unlock.