DESCRIPTION & OPERATION
The module communications network provides the ability for module-to-module communication by sharing inputs and outputs instead of each component having an input and output wired directly to each module. A BUS which consists of a pair of twisted wires is used to transfer information between each module. The BUS network is also referred to as Standard Corporate Protocol (SCP). The BUS consists of a (+) circuit No. 914 and a (-) circuit No. 915. The BUS is routed throughout the vehicle to each module except the air bag diagnostic monitor.
The air bag diagnostic monitor does not use the BUS to communicate with other modules. The air bag diagnostic monitor is connected to the International Standards Organization (ISO) 9141 diagnostic communications network through a single wire (circuit No. 70). Both networks are connected to the Data Link Connector (DLC). This article is used to diagnose BUS and ISO communications network circuit faults. For module locations, see COMPONENT LOCATIONS table.
| Component | Location |
|---|---|
| Air Bag Diagnostic Monitor (1) | Between Front Seats, Below Center Console |
| Anti-Lock Brake System (ABS) Control Module | Left Front Of Engine Compartment |
| Data Link Connector (DLC) | Below Driver's Side Of Instrument Panel, To Right Of Steering Column |
| Driver's Door Module (DDM) | Inside Driver's Door |
| Driver's Seat Module (DSM) | Under Driver's Front Seat |
| Electronic Automatic Temperature Control (EATC) Module | Behind Center Of Instrument Panel |
| Front Control Unit (FCU) (2) | Behind Center Of Instrument Panel, On Radio |
| Lighting Control Module (LCM) | On Instrument Panel, Behind Headlight Switch |
| Powertrain Control Module (PCM) | In Passenger's Side Of Engine Compartment, On Firewall |
| Remote Emergency Satellite Cellular Unit (RESCU) Module | Passenger's Side Rear Corner Of Trunk, Behind Trim Panel, In Front Of Taillight Assembly |
| Speed Control Servo/ Amplifier Assembly (3) | Mounted On Left Shock Tower |
| Vehicle Dynamic Module (VDM) | In Driver's Side Of Trunk, On Panel Below Rear Window |
| Virtual Image Instrument Cluster (VIC) | Behind Left Side Of Instrument Panel |
| (1) Air bag diagnostic monitor may also be referred to as Electronic Crash Sensor (ECS) module. (2) FCU may also be referred to as Audio Control Module ACM). (3) Speed control servo/amplifier assembly may also be referred to as Next Generation Speed Control NGSC) servo. | |
| (1) | Air bag diagnostic monitor may also be referred to as Electronic Crash Sensor (ECS) module. |
| (2) | FCU may also be referred to as Audio Control Module ACM). |
| (3) | Speed control servo/amplifier assembly may also be referred to as Next Generation Speed Control NGSC) servo. |
COMPONENT LOCATIONS