Description & Operation

Vehicle has 2 module communications networks. The Powertrain Control Module (PCM) and Passive Anti-Theft System (PATS) 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 (+) circuit 4-PB9 and a (-) circuit 5-PB9. The Anti-Lock Brake System (ABS) module is connected to the ISO 9141 diagnostic communications network through a single wire (circuit 8-CF29). 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.