With Keyless Entry

Door locking and unlocking can be accomplished as follows:
^ Pressing a door lock switch causes all doors to lock or unlock in unison.
^ Each lock can be operated manually.
^ Pressing the UNLOCK button on the keyless entry transmitter once unlocks the LH front door only. Pressing the UNLOCK button again within five seconds unlocks all doors, and (for Pontiac only) it unlocks the fuel door
^ Pressing the LOCK button on the keyless entry transmitter locks all doors, and (for Pontiac only) it locks the fuel door.

Door Lock/Unlock Actuator Circuits
Reversible actuators control the power door locks. The power door electrical system controls the actuators by applying battery voltage to one terminal and ground to the other terminal. The Body Control Module (MALL) supplies this battery voltage and ground when the module receives a door lock or unlock input signal. Normally MALL module connector C1 terminals A and C are both at ground. To lock the doors, the MALL module control at connector C1 terminal C switches to battery voltage. The module provides battery voltage to all actuators on CKT 295 (GRY). The opposite side of each actuator is connected to MALL module connector C1 terminal A, which is still at ground This grounded circuit path is CKT 694 (TAN) for the LH front door lock actuator. The grounded circuit path is CKT 694 (TAN), the normally-closed contacts of the LH front door isolation relay and CKT 294 (TAN) for the other three door lock actuators and (for Pontiac only the fuel door release solenoid. The actuator in each door runs to move the door locks to the LOCK position. To unlock the doors. the MALL module accomplishes the unlock function in the same way, but the RFA-controlled LH Front Door lock Isolation Relay in this circuit allows for two methods of unlocking
^ Only the LH front door locks.
^ All doors unlock and (for Pontiac only) the fuel door unlocks.

Pressing the UNLOCK button on the keyless entry transmitter provides an unlock signal to both the RFA and MALL, modules. The RFA module turns on its output at terminal E6, which grounds CKT 1391 (LT GRN). The coil of the LH Front Door Lock Isolation Relay energizes, opening the normally-closed relay contacts. This action disables the door lock circuit to the RH front door lock and the rear door locks and (for Pontiac only), the fuel door release solenoid. At the same time, the MALL module provides battery voltage on CKT 694 (TAN) to the LH front door lock actuator while holding CKT 295 (GRY) at ground. The LH front door unlocks.

When the UNLOCK button is pressed a second time (within 5 seconds of the first press), the RFA module turns off its output at terminal E6, removing the ground from CKT 1391 (LT URN), de-energizing the isolation relay. The relay contacts close, connecting CKT 694 (TAN) to CKT 294 (TAN). This action provides battery voltage to the rest of the door lock actuators and (for Pontiac only), to the fuel door release solenoid, on CKT 294 (TAN) while CKT 295 (GRY) is still held at ground. The rest of the doors unlock, and (for Pontiac only), the fuel door unlocks.

The door lock actuators are usually powered for just a moment. If they are remain on, an electronic circuit breaker in each actuator opens to protect against damage. Each circuit breaker has a positive temperature coefficient (PTC) which resets automatically when voltage is removed from the actuator.

Door Lock/Unlock Input Circuits
To initiate door locking or unlocking, the MALL module receives an input signal at two terminals, C6 and C7 on connector C2. These circuits, CKT 781 (ORN/BLK) and CKT 195 (LT BLU), are common to both the keyless entry system and the switches on the front doors.

Unlock Input Circuit
Pressing a door lock switch to the UNLOCK position connects CKT 781 (ORN/BLK) through the switch to ground CKT 1250. CKT 781 (ORN/BLK) grounds the MALL module connector C2 terminal C6 to provide the door unlock input signal.

Pressing the door unlock button on the keyless entry transmitter causes the Remote Function Actuator (RFA) module to ground terminal E5 With this action, the RFA module grounds CKT 781 (ORN/BLK) which grounds the MALL module connector C2 terminal C6 to provide the door unlock input signal.

Lock Input Circuit
Pressing a door lock switch to the LOCK position connects CKT 780 (RED/BLK) through the switch to ground CKT 1250. CKT 780 (RED/BLK) grounds the RFA module at terminal El 3 to provide the door lock input signal to the RFA module. The RFA module in turn grounds the control signal at terminal E4, pulling CKT 195 (LT BLU) to ground. This action grounds the MALL module connector C2 terminal C7 to provide the door lock input signal. CKT 195 (LT BLU) is also the input circuit for the keyless entry unlock function. Pressing the door lock button on the keyless entry transmitter causes the RFA module to ground terminal E4. With this action, the RFA module grounds CKT 195 (LT BLU), which grounds the MALL module connector C2 terminal C7 to provide the door lock input signal.

Automatic Door Locks
The automatic door lock function is controlled by the RFA Module on vehicles equipped with keyless entry. The RFA Module receives a signal from the Park/Neutral Position Switch signaling that the gear selector is in PARK or not. When the LH front door is closed, the vehicle is in RUN and the gear selector is shifted out of PARK, the RFA Module provides a signal to the Body Control Module (MALL) to lock the doors. If programmed to do so, the RFA Module also unlocks the doors when the gear selector is put back in to PARK.