Power Locks: Description and Operation

The Power Door Lock system operates to lock or unlock all doors with the actuation of a single Door Lock Switch. Power is available at all times from the DOOR LOCK Fuse through circuit 1240 to the LF and RF Door Lock Switch. This voltage is also supplied to the Door Lock and Door Unlock Relays. Both relays are grounded through circuit 150 at ground G201.

Each Door Lock Switch has two contacts. When the upper portion of the Door Lock Switch is depressed to unlock the doors, one contact closes to apply voltage to circuit 194. This voltage is applied to coil side of the Door Unlock Relay. Since the coil in the relay is grounded at all times through circuit 150 and ground G201, the coil is energized. The relay switch contacts then close to apply voltage to circuit 294. Circuit 294 applies voltage to all the Door Lock Motors which are grounded through circuit 295 and the normally grounded contacts of the Door Lock Relay.

When the lower portion of the Door Lock Switch is depressed to lock the doors, the other switch contact closes to apply voltage to circuit 195. This voltage is applied to the coil side of the Door Lock Relay. Since the coil in the relay is grounded at all times through circuit 150 and Ground G201, the coil is energized. The relay switch contacts then close to apply voltage to circuit 295. Circuit 295 applies voltage to all the Door Lock Motors which are grounded through circuit 294 and the normally grounded contacts of the Door Unlock Relay.


With Keyless Entry
The RF and both rear Door Lock Motors operate as described above when the vehicle is equipped with Key less Entry. The LF Door Lock Motor however, does not operate in the same manner. When either Door Lock Switch is moved to the LOCK position, the operation is similar to the above operation, but the LF Door Lock Motor receives ground through circuit 694 and the Remote Control Door Lock Receiver. If either Door Lock Switch is moved to the UNLOCK position, circuit 194 and the Remote Control Door Lock Receiver receives voltage. When the Remote Control Door Lock Receiver receives this unlock signal, it then applies voltage to the LF Door Lock Motor through the 694 circuit. The motor is then grounded through circuit 295 as described above. For further explanation of the Keyless Entry system, refer to Keyless Entry. Keyless Entry