Description & Operation: Notes

The module communications network provides the capability 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 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. See Fig 1. The air bag diagnostic monitor does not use the BUS to communicate with other modules. For module locations, see COMPONENT LOCATIONS TABLE. In the event that a system failure exists, a Diagnostic Trouble Code (DTC) will be stored in the module. A New Generation Star (NGS) scan tester and Data Link Connector (DLC) may be used for retrieving and clearing DTCs from the modules. DTC may be used for system diagnosis.

NOTE: Terminal No. 7 (Light Blue/White wire) of the DLC goes directly to air bag diagnostic monitor. This wire is referred to as the ISO 9141 communication link circuit No. 70 and provides a means for the scan tester to communicate with the air bag diagnostic monitor by using the DLC.

COMPONENT LOCATIONS

Component	Location
Air Bag Diagnostic Monitor	Behind Instrument Panel On Tunnel Of Floorpan
Data Link Connector (DLC)	Below Driver's Side Of Instrument Panel, To Right Of Steering Column
Passive Anti-Theft System (PATS) Module	Below Driver's Side Of Instrument Panel, To Left Of Steering Column
Powertrain Control Module (PCM)	Behind Passenger's Side Kick Panel

Fig 1: Locating Module Communication Network Components

Courtesy of FORD MOTOR CO.