ISO 9141 Communication Link

ISO 9141 Communication Link

The ISO 9141 communication link:
- consists of a single wire, Circuit 70 (LB/W).
- provides a common link for communication to an off-board tester through the Data Link Connector (DLC) located under the instrument panel to the right of the steering column.
- does not allow module-to-module communications. One micro-processor based subsystem is included on this network:
- supplemental air bag system

Fault Tolerance

The 1509141 communication link will fail if any of the following occur:
- Circuit 70 (LB/W) shorted to ground.
- Circuit 70 (LB/W) shorted to battery positive voltage (B+).
- the air bag diagnostic monitor loses power or ground supply.
- a module failure shorts the 1809141 communication link internally.

Purpose

The information within this section is designed to diagnose 1S0 9141 communication link concerns. These concerns may:
- affect normal functional operations of the vehicle.
- be directly related to customer concerns.
- be undetectable except during diagnostics. To properly diagnose a link concern, follow the diagnostic procedure described in this section in the order presented.


Module Identification

Modules included on this 1809141 communication link include:

Air bag diagnostic monitor:
- located behind the instrument panel on the tunnel of the floorpan.
- if communication to the air bag diagnostic monitor fails Test D: the Air Bag Diagnostic Monitor Communication Fault