Power Locks: Description and Operation

Circuit Description
Battery voltage is supplied to both the door lock and unlock relay in the door lock control module at all times from fuse 15. There is a metal rod that links the left front door lock/unlock switch and the left front door lock actuator. When the left front door lock/unlock switch is pushed to lock, the metal rod then pushes the actuator switch in the left front door lock actuator to the lock position. The ETACM receives the lock input signal and then supplies power to the left/right rear, tail gate lock actuator (5 door only) and right front door lock actuator.

Each motor is grounded through a limit switch in the appropriate door lock actuator. The ETACM will de-energize the relay coil when the limit switches in the door lock actuators move to the unlock position. The door locks work similarly when the left front door lock switch is pushed to unlock, except that the electrical current goes through each motor in the opposite direction.