Description & Operation
Vehicle has 2 module communications networks. 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) network. 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 Electronic Crash Sensor (ECS) module.
The air bag ECS module does not use the BUS to communicate with other modules. The air bag ECS module 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 LOCATIONS
| Component |
Location |
| Air Bag Electronic Crash Sensor (ECS) Module |
Behind Right Side Of Instrument Panel Cowl Trim Panel |
| Air Suspension/Electronic Variable Orifice (EVO) Steering Module |
Below Right Side Of Instrument Panel |
| Anti-Lock Brake System ABS) Control Module |
Right Front Of Engine Compartment, Under Upper Radiator Support |
| Data Link Connector (DLC) |
Below Left Side Of Instrument Panel, To Right Of Steering Column |
| Driver's Door Module (DDM) |
Inside Driver's Door |
| Driver's Seat Module |
Under Driver's Seat |
| Electronic Automatic Temperature Control (EATC) Module |
Center Of Instrument Panel |
| Front Radio Control Unit |
Behind Center Of Instrument Panel, On Radio |
| Powertrain Control Module (PCM) |
In Engine Compartment On Left Side Of Firewall |
| Lighting Control Module (LCM) |
Behind Left Side Of Instrument Panel, To Right Of Steering Column |