PT Cruiser L4-24L VIN B (2001) Information Bus Component Diagram
Information Bus: Description and Operation
COMMUNICATION
The Programmable Communication Interface or DRB III 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. The modules are wired in parallel.
Connections are made in the harness using splices. The following modules are used on 2001 PT:
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Occupant Restraint Controller
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Left SIACM
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Right SIACM
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Controller Antilock Brake
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Powertrain Control Module
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Remote Keyless Entry Module
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Sentry Key Immobilizer Module
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Radio
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Transmission Control Module
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Mechanical Instrument Cluster
Each module provides its own drive 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.