Door Locks: Description and Operation

Voltage is applied at all times to the LH and RH Power Door Lock Switches and Power Door Lock Relay through the POWER SEAT and DOOR LOCK fuses of the Interior Fuse Panel. When either switch is in the LOCK position battery current is supplied to the Power Door Lock Relay. The relay senses the battery current, closing the lock switch and sending battery current to the Power Door Lock Motor. The Power Door Lock Motor is grounded through the UNLOCK switch and locks the door.

When either switch is in the UNLOCK position, voltage that is less than battery voltage (due to the resistor in the Power Door Lock Switch), is applied to the Power Door Lock Relay. The relay senses the signal as being less than battery voltage and the UNLOCK switch is closed. Voltage is applied in the opposite direction through the Power Door Lock Motors and grounds through the LOCK switch. The motor unlocks the doors.