Communications Network: Description and Operation

COMMUNICATIONS NETWORK

4-Wheel Anti-Lock Brake Traction Control (ABS/TC) Control Module Or Stability Assist Module (if equipped)
The anti-lock brake system/traction (ABS/TC) control module or stability assist module (if equipped) are on the standard corporate protocol (SCP) communication network. The ABS/TC Control module or stability assist module controls the brake pressure to the four wheels to keep the vehicle under control while braking.

Front Electronic Module (FEM)/Rear Electronic Module (REM)
The front electronic module (FEM) and rear electronic module (REM) are connected to the SCP communication network. The FEM and the REM control both interior and exterior lighting and active anti-theft functions.

Restraint Control Module (RCM)
The restraint control module (RCM) is on the international standards organization (ISO) 9141 network. The RCM controls the deployment of the air bags based on sensor input.

Instrument Cluster
The instrument cluster is on the SCP communication network. It is an analog face cluster with a digital odometer. The instrument cluster displays a variety of information.

Powertrain Control Module (PCM)
The powertrain control module (PCM) is on the controller area network (CAN) communication network and the SCP network. The PCM uses the CAN network to communicate with the diagnostic tool and utilizes the SCP network to communicate with other modules. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage. Refer to Computers and Control Systems for diagnosis and testing of the PCM.

Dual Automatic Temperature Control (DATC) Module
The dual automatic temperature control (DATC) module is on the SCP communication network and the universal asynchronous transmitter-receiver (UART)-based protocol (UBP) communications network. The DATC module uses the SCP network to communicate with the diagnostic tool and other modules. The UBP network is used by the DATC module for communication with the driver climate control seat module. The DATC module controls automatic climate functions that maintain the vehicle interior temperature at a constant setting.

Audio Control Module (ACM)
The audio control module (ACM) is connected to the SCP communication network and also to the audio control protocol (ACP) communication network. The ACM communicates with the compact disc player/changer using the ACP. The ACM uses the SCP network for diagnostics.

Navigation System Module
The navigation system module is on the SCP communication network. The navigation system module communicates with the audio unit using a dedicated CAN network. The vehicle navigation system provides a feature that will guide the user to any entered destination. The system uses the global positioning sensor (GPS), vehicle speed, and other sensor information to accurately establish the vehicle position. The navigation system module compares this position to the DVD vector map. The system then provides the maneuvers required during the journey in order to arrive at the destination entered.

Driver Seat Module (DSM)
The driver seat module (DSM) is on the SCP communication network. The DSM controls the positioning and programming of the driver seat.

Driver Climate Control Seat Module
The driver climate control seat module is on the universal asynchronous transmitter-receiver (UART)-based protocol UBP communications network. The driver climate control seat module and DATC module control the heating and cooling elements in the seat for passenger comfort.

Passenger Climate Control Seat Module
The passenger climate control seat module is on the UBP communications network. The passenger climate control seat module and DATC module control the heating and cooling elements in the seat for passenger comfort.

Parking Aid Module
The parking aid module is connected to the UBP communications network. The module controls sensors in the rear bumper that detect close objects when the transmission is in REVERSE.

Electric Parking Brake Module
The electric parking brake module is connected to the SCP communication network. The module controls the solenoid which applies and releases the parking brake.

Driver Door Module (DDM)
The driver door module (DDM) is connected to the SCP communication network. The DDM accepts the user memory set and recall buttons. The DDM then sends the memory set and recall commands to the other modules over the SCP bus. The DDM also controls the driver mirror (memory positions are stored there and manual functions are controlled there). The DSM controls the driver seat. The FEM control the passenger mirror and adjustable pedals positions. The instrument cluster controls the steering column positions.