With the actuation of a single door lock switch, the power door lock system locks or unlocks all of the doors. Power is available at all times from the PWR ACCY Fuse A through CKT 540 (ORN) to the following components:
| • | The left front power door lock switch |
| • | The right front power door lock switch |
| • | The rear power door lock switch (except on cutaway models) |
| • | The power door lock relay |
| • | The power door lock control module. |
Both the relay and the module have ground by CKT 150 (BLK) at ground G201, or at ground G201 and ground G200 in vehicles with upfitter provisions.
Each of the door lock cylinder rocker switches have 2 contacts. Depressing the upper portion of the rocker switch in order to unlock the doors closes 1 contact. This applies voltage in CKT 194 (WHT) to the unlock coil in the power door lock relay. Because the other side of the relay's coils are grounded through CKT 150 (BLK), at ground G201 in base model vehicles or at ground G200 in vehicles with upfitter provisions, the coil energizes. The relay contacts then operate in order to apply voltage in CKT 294 (TAN). Current flows to all power door lock actuator motors, through CKT 295 (GRY), and through the lock relay which is connected to ground. Thus, each power door lock actuator has voltage and ground. The motors operate in the direction that unlocks the doors.
Depressing the lower portion of the power door lock switch in order to lock doors closes the other contact. This applies voltage in CKT 195 (LT BLU) to the lock coil in the power door lock relay. The lock coil energizes. The contacts operate in order to apply voltage in CKT 295 (GRY). Current flows to all power door lock actuator motors, through CKT 294 (TAN), and through the unlock relay which is connected to ground. Thus, each power door lock actuator has voltage and ground. The motors operate in the direction that locks the doors.
The power door lock control module, controls the activation of the power side door lock actuator motor. With the side door open, actuation of the lock function locks the front doors and the rear door immediately. However, the side door lock actuator motor does not operate, because the contacts at the side door contact plate are open. When the lock operation is selected voltage is applied in CKT 195 (LT BLU) to the power door lock control module. This is the command voltage. When the power door lock control module receives the command voltage with the side door open, the signal is grounded through the side door jamb switch in CKT 158 (WHT/BLK). This activates the delay function of the power door lock module. The control module waits for the opening of the side door jamb switch with the closure of the side door. The closure of the door starts a timer. After approximately 5 seconds, the power door lock control module produces another lock command. The voltage in CKT 195 (LT BLU) actuates the power door lock relay in order to operate all the power door lock motors. Because the side door is now closed, the side door contact plate makes contact and the side door locks.
If during the 5 second delay, the side door reopens, the power door lock control module remains enabled. The control module waits for closure of the side door. The side door locks 5 seconds after the side door closes. If, during the timing process, the module receives in CKT 194 (WHT) the command for unlocking all of the doors, both the logic and the timer reset. The side door does not lock, even when the door is already closed.
