Description & Operation
Vehicle has 2 module communications networks. The Standard Corporate Protocol (SCP) network communicates over a pair of unshielded twisted wires (data bus). The SCP bus links the Powertrain Control Module (PCM), Passive Anti-Theft System (PATS) module, Electronic Automatic Temperature Control (EATC) module and Data Link Connector (DLC). The International Standards Organization (ISO) 9141 network communicates over a single wire connecting the Restraints Control Module (RCM), Generic Electronic Module/Central Timer Module (GEM/CTM), 4-Wheel Anti-Lock Brake System (4WABS) module, Driver Seat Module (DSM), Parking Aid Module (PAM), Air Suspension Control (ARC) module and DLC.
SCP network has the ability to continue to function with one of its wires open, shorted to power or shorted to ground. ISO 9141 network is unable to function if an open or short occurs in its wire. ISO 9141 network does not allow intermodule communication. Scan tool must initiate communication with modules on ISO 9141 network. Both networks can be accessed with scan tool at DLC. This article is used to diagnose SCP and ISO 9141 communications network circuit faults. For module locations, see COMPONENT LOCATIONS table.
| Component | Location |
|---|---|
| Air Suspension Control Module | Behind Instrument Panel, Right Of Center |
| Central Junction Box | Behind Instrument Panel, Left Side |
| Data Link Connector | Below Driver's Side Of Instrument Panel, To Right Of Steering Column |
| Driver Seat Module | Below Driver's Seat |
| Electronic Automatic Temperature Control Module | Behind Center Of Instrument Panel |
| Generic Electronic Module/Central Timer Module | Behind Center Of Instrument Panel |
| Parking Aid Module | Behind Spare Tire |
| Passive Anti-Theft System Control Module | Behind Instrument Panel, Top Right Side |
| Powertrain Control Module) | Mounted Through Firewall, On Passenger's Side |
| Remote Anti-Theft Personality Module | Behind Left Rear Quarter Panel |
| Restraints Control Module | Behind Right Side Of Instrument Panel |
| 4-Wheel Anti-Lock Brake System Module | Left Side Of Engine Compartment |