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. The driver door module (DDM) is the master control for the door lock system but the rear integration module (RIM) determines when the lock functions are permitted.

Each passenger door interior lock switch is wired to its associated door module. The driver door interior lock switch is wired to the driver door switch assembly (DDSA). The DDSA and the passenger door modules send the lock switch requests to the DDM over the power door 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 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. If the RIM determines that a lock or unlock function is permitted, it sends a class 2 message back to the DDM commanding the DDM to perform the function permitted. The DDM then sends commands to the rest of the door modules via the power door serial data circuit to implement the selected locking function.

Each door module supplies battery positive voltage and ground, through the door lock actuator motor drive 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 drive circuit the battery positive voltage is applied to, and which motor drive circuit the ground is applied to. To perform a lock function, the module applies battery positive voltage to the door lock motor lock circuit, and ground to the door lock motor unlock circuit. To perform a Unlock function, the module reverses the polarity and applies battery positive voltage to the door lock motor unlock circuit, and ground to the door lock motor lock circuit.

In order to receive an input from its associated door lock switch, the passenger door module supplies battery positive voltage and ground to the switch. Their are two circuits for battery positive voltage, one for a lock input, and one for a unlock input. The module supplies ground to the switch via a third circuit. When the switch is activated for a lock or unlock function, voltage flows through the switch, providing the module with the neccessary input.

In order to receive an input from its associated door lock switch, the left rear door module and the right rear door module supply battery positive voltage and ground to their associated switch. As a safety feature, the rear door lock switches do not have circuits for the unlock function. When one of these switches is activated for a lock function, voltage flows through the switch, providing the module with the neccessary input.

The driver door lock switch is the same as the passenger door lock switches, but it is wired to the driver door switch assembly (DDSA), and, for a ground circuit, the driver door module. It works the same way as the passenger lock switches work but the switch input information is processed by the DDSA. The DDSA has two circuits that supply 5 volts to the driver door lock switch, one for a lock input, and one for a unlock input. The driver door lock switch ground circuit is provided by the driver door module. When the door lock switch is activated, voltage flows through it, thus providing the DDSA with the neccessary input. The DDSA then relays the switch information to the driver door module via the power door serial data line.

The automatic door lock system provides for locking or unlocking all or one of the doors when shifting the transmission in and out of PARK, or, when turning the ignition key to the OFF position. 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. For customized selections available and programming instructions, refer to: Personalization Description and Operation

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.

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. 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 the DDM to unlock all doors. The DDM sends a power door serial data message to the other door modules to unlock all doors.

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