The vehicle is equipped with power door locks. Each lock actuator is powered and controlled by the door module mounted in the individual door. The driver door module (DDM) is the master control for the door lock system but the rear integration module (RIM) contains the program that determines when the lock functions are permitted.

The exterior key cylinders are wired to either the DDM or the passenger door module (PDM), depending on the location of the key cylinder. The interior lock switches are wired to the driver door switch assembly (DDSA) and the PDM. The DDSA and the PDM send the lock switch requests to the DDM over the simple bus interface (SBI) serial data circuit. The DDM then sends the lock requests to the RIM over the Class 2 serial data circuits.

The door lock operation modes are controlled by the rear integration module (RIM). The RIM examines the requested function from the DDM, or the remote function actuator (RFA), as well as the transmission shift selector position and the ignition switch position information available over the Class 2 serial data circuits. The RIM determines if a locking function is permitted, and commands the DDM to perform the function permitted. The DDM then sends commands to the rest of the door modules via the SBI to implement the selected locking function.

All programmable modes of lock system operation are stored in the RIM. The RIM checks the lock function program selected against the lock requests, the transmission selection and ignition key switch condition to determine if the requested function is permitted. If the requested function is permitted, the RIM then commands the DDM to perform the lock function over the Class 2 serial data circuits. The DDM commands the individual door modules to perform the lock function over the SBI serial data circuit.

The following table lists the modes of operation of the automatic door lock system. This system is commanded according to the information stored in the RIM. The RIM receives the driver selected features from the driver information center (DIC). The RIM commands the driver door module (DDM) which in turn commands the individual passenger door modules.

Shift Out Of Park Lock -- will lock all doors when the transmission selector leaves the PARK position.

Ignition Off Unlock -- will unlock doors when the ignition switch is turned to OFF from another position.

Shift Into Park Unlock -- will unlock doors when the transmission selector is placed into PARK from any other position.

Perform the following procedure with the scan tool:

1. Select Body.
2. Select Personalization.
3. Select Options.
4. Select Driver #1 (or Driver #2) Automatic Lock Mode.
5. Use arrow keys to scroll through options.
6. Use the Enter key to enable (turn on *) and disable (turn off *) modes.
7. Press Save Options when done.

This personalization feature permits the delay of all door locking until 5 seconds after the last door is closed. This feature is controlled by the RIM which operates based on data received over the Class 2 serial data circuits.

1. When the lock function is requested (either by the remote function actuator (RFA) or the DDM) while a door is open, the RIM commands the radio (over the Class 2 serial data circuits) to sound the chime 3 times to signal that the delayed locking is active.
2. When the DDM receives the message that all doors are closed from the rest of the door modules and sees that the driver door is also closed, it sends a Class 2 message to the RIM.
3. The RIM waits for 5 seconds, then sends the Class 2 message to the DDM to lock doors. The DDM send the SBI message to lock the doors to the rest of the door modules.

If a door is opened during the 5 second delay period, the RIM resets the timer and waits until it receives the door closed message from the DDM to restart the delay period.

Pressing a power lock switch on a door or on the remote transmitter for the RFA causes the RIM to override this feature and lock all doors immediately.

Perform the following procedure with the scan tool:

1. Select Body.
2. Select Personalization.
3. Select Options.
4. Select Driver #1 (or Driver #2) Delayed Locking.
5. Use arrow keys to scroll through options.
6. Use the Enter key to enable (turn on *) and disable (turn off *) modes.
7. Press Save Options when done.

The power locks will not lock when the following conditions exist:

The anti-lockout feature is overridden by holding the lock switch in the LOCK position for more than 3 seconds.

The central door unlock feature is activated when either of the following happens:

The DDM sends a Class 2 message to the RIM indicating the above. The RIM sends a Class 2 message to the DDM to unlock all doors. The DDM sends a SBI message to the other door modules to unlock all doors.