Test Notes

Door Lock Motors/Switches Inoperative

The door locks are wired so that the lock and unlock switches on the doors/liftgate can operate the door locks with or without a receiver assembly installed in the system. The door lock switches are wired directly to the relays that control the door locks.

When the receiver assembly operates the door locks, it provides a ground just like the door lock switches. Both the GEM and receiver assembly operate the door unlock relays.

(GEM performs the two-key-turn unlock. Refer to Section 18-04A .) If the receiver assembly and GEM are both disconnected and the door locks still don't work, there is a switch, motor, lock mechanism, fuse or
wiring issue.

The receiver assembly uses the LOCK ALL and UNLOCK ALL Circuits 119 and 120 as outputs, but also monitors these circuits as inputs to see when the door lock switches are pressed.

Pressing the UNLOCK switch on the door can unlock all doors. It unlocks the driver's door by supplying power to the driver's door lock motor through the normally closed contacts of the driver's door unlock relay.

NOTE: If state is SHORT, check and service Circuits 120 (PK/LG) and 119 (PK/Y) for short to ground or each other.