Locking

Setting the LH or RH front side door lock switch to the LOCK position provides an input signal to the body control module (BCM) which in turn provides a lock output (ground) signal to the lock coil of the door lock relay.

The relay energizes and B+ is supplied to all of the side door lock actuators when ground applies to the door lock relay lock coil. This causes them to energize and to lock all the doors.