Description & Operation

Vehicle has 2 module communications networks. The Powertrain Control Module (PCM), Passive Anti-Theft System (PATS) module and Electronic Automatic Temperature Control (EATC) module are connected to the multiplex communications network through a pair of twisted wires or BUS. 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 Restraint Control Module (RCM), Generic Electronic Module/Central Timer Module (GEM/CTM), Remote Anti-Theft Personality (RAP) module, 4-Wheel Anti-Lock Brake System (4WABS) module, Driver Seat Module (DSM), Parking Aid Module (PAM) and air suspension control module are 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.