The power door lock system consists of the following components:

The power door lock system can be controlled by any of the following:

The vehicle is equipped with power door locks. Each lock actuator is powered and controlled by the door module mounted in the individual door, but the rear integration module (RIM), which is the master control for the door lock system, determines when the lock functions are permitted. The RIM receives and examines the requested lock function from the individual door modules, or from the remote function actuator (RFA) via the class 2 serial data circuit. The RIM also examines the transmission shift selector position and the ignition switch position information available over the Class 2 serial data circuits. If the RIM determines that a lock or unlock function is permitted, it sends a class 2 message back to the individual door modules commanding them to perform that Lock or Unlock function.

In order to control power door lock operations, as well as other door functions, door modules must be powered up. Battery voltage is supplied by the rear fuse block, through separate circuits, to each door module. Each door module is separately grounded through a ground stake. The door modules also use these power and ground supplies to provide voltage and ground to their associated window switch. In addition, the front door modules use these power and ground supplies for outside rearview mirror operation, and to power the window express up sensors.

Door modules battery voltage is supplied as follows:

These circuits are in the C3 harness connector of each door module and must not be confused with the battery voltage and ground circuits that are used exclusively to drive the power window motors. For more information concerning the window motor power and ground circuits, refer to Power Windows Description and Operation

For battery voltage and ground, the front passenger door power lock switch is wired to the front passenger door module. There are two circuits for battery voltage, one for a lock signal, and one for an unlock signal. The module supplies ground to the switch via a third circuit. When the switch is operated for a lock or unlock function, the normally open switch contacts for that function are closed to ground and voltage flows through the switch, providing the module with the appropriate signal input.

The driver door lock switch is similar to the front passenger door lock switch, however, for voltage it is wired to the driver door switch assembly (DDSA). The ground circuit is supplied by the driver door module (DDM). It also works the same way as the front passenger door lock switch, but the switch signal input information is detected and processed by the DDSA and less operating voltage is required. The DDSA has two circuits that supply 5 volts to the switch, one for a lock signal, and one for an unlock signal. When the switch is operated for a lock or unlock function, the normally open switch contacts for that function are closed to ground, the voltage flows through the switch and is detected by the DDSA. The DDSA then relays the switch information to the DDM via the class 2 serial data circuit.

The rear door lock switches are similar to the front door lock switches. However, unless the vehicle is equipped with the V4U Limousine option, no circuits are provided for unlocking the doors from the rear door lock switches. For battery voltage and ground, the rear passenger door lock switches are wired to the rear passenger door modules. Only one circuit is provided to each switch for battery voltage, the lock signal circuit. There are no circuits provided to these switches for the unlock function. The rear door modules each supply ground to their respective switch via a ground circuit. When either switch is activated for a lock function, the normally open switch contacts for that function are closed to ground and voltage flows through the switch, providing the module with the appropriate lock signal input.

A power door lock motor is contained within each door lock actuator. Each door module supplies battery voltage and ground, through the door lock actuator motor control circuits to its associated door lock actuator motor. The power door lock motors are reversible. The function performed by the lock motor, Lock or Unlock, depends on which motor control circuit the voltage is applied to, and which motor control circuit the ground is applied to. To perform a lock function, the module applies voltage to the door lock motor lock circuit, and ground to the door lock motor unlock circuit. To perform an unlock function, the door module reverses the polarity and applies voltage to the door lock motor unlock circuit, and ground to the door lock motor lock circuit.

The automatic door lock system provides for locking or unlocking one, or, all of the doors when shifting the transmission. When the vehicle doors are closed, the ignition is turned to ON, and the transmission is shifted out of Park, all the doors will lock. When the vehicle is stopped and the transmission is shifted into Park one, or, all of the doors will unlock. This system is also commanded according to the information stored in the RIM. Automatic door locking is programmed during the manufacturing process but it can be custom programmed by the operator. For information concerning custom programming available and programming instructions, refer to Driver Personalization in Personalization.

Leaving the key in the ignition with any door open will disable the use of the power door locks and the Remote Keyless Entry (RKE) lock function.

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

With this feature, all doors can be unlocked from the driver door using the door key. The central door unlock feature is activated when the driver door key is inserted into the driver door lock cylinder and turned to the Unlock position. This activates the door key cylinder unlock switch, which is fastened to the driver door lock cylinder on the inside of the door. For power and ground, the door key cylinder unlock switch is wired to the driver door module (DDM). The doors will unlock 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 all of the door modules to unlock all doors.

The DDM supplies battery voltage through the driver door key switch signal circuit, and ground via a ground circuit to the normally open contacts of the door key cylinder unlock switch. When the switch is closed, voltage flows through the switch, providing the DDM with the neccessary signal input.