Voyager L4-2.4L VIN B (2001)
Body Control Module: Description and Operation
Part 3 of 5
Part 3A
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 white with a violet tracer. Additional tracer colors may be added
to the violet in order to distinguish between different module connections. The modules are wired in parallel. Connections are made in the harness
using splices.
One 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 RS:
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Body Control Module
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Front Control Module
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Occupant Restraint Controller
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Left Side Impact Airbag Control Module
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Right Side Impact Airbag Control Module
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Controller Antilock Brake
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Powertrain Control Module
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Radio
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CD Changer
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Transmission Control Module
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Automatic Temperature Control Module
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A/C Heater Control Module (MTC)
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Sentry Key Immobilizer Module
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Memory Seat(Mirror Module)
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Overhead Console
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Mechanical Instrument Cluster
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Left Sliding Door Control Module
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Right Sliding Door Control Module
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Power Liftgate 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
are transmitting and is pulled up to about seven and a half volts when modules are transmitting.
