Door Lock Operation

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.