Town Car V8-4.6L VIN W (1997)
Multiplex Communication Network: Description and Operation
ISO 9141 Communication Link
The ISO 9141 communication link:
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consists of a single wire, Circuit 70 (LB/W).
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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.
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does not allow module-to-module communications.
The micro-processor based subsystems included on this network are:
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anti-lock brakes
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supplemental air bag system
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keyless entry
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perimeter anti-theft
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power locks and windows
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interior lighting control
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warning indicator control
Fault Tolerance
The ISO 9141 communication link will fail if any of the following occur:
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Circuit 70 (LB/W) shorted to ground.
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Circuit 70 (LB/W) shorted to battery positive voltage (B+).
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the module loses power or ground supply.
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a module failure shorts the communication network internally.
Purpose
The information within this section is designed to diagnose ISO 9141 communication link concerns.
These concerns may:
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affect normal functional operations of the vehicle.
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be directly related to customer concerns.
