Dakota 2WD L4-2.5L VIN P (2001)
VEHICLE COMMUNICATION
The Programmable Communication Interface or PCI Bus is a single wire multiplexed network capable of supporting binary encoded messages
shared between multiple modules. The PCI bus circuit is identified as D25 and is violet with a yellow tracer. Additional tracer colors may be
added to the yellow in order to distinguish between different module connections. The modules are wired in parallel. Connections are made in the
harness using a splice.
The splice called the Diagnostic Junction Port, serves as the "Hub" of the bus. The Diagnostic Junction Port provides an access point to isolate
most of the modules on the bus in order to assist in diagnosing the circuit. The following modules are used on the AN and AN84:
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Airbag Control Module
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A/C Heater Control
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Central Timer Module
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Controller Antilock Brake
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Compass Mini-Trip Computer
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Electro/Mechanical Instrument Cluster
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Powertrain Control Module
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Radio
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Sentry Key Immobilizer Module
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Transfer Case Control Module
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Transmission Control Module
Each module provides its own bias and termination in order to transmit and receive messages. The bus voltage is at zero volts when no modules
