PT Cruiser L4-2.4L Turbo VIN G (2004)
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. The modules are wired in parallel. Connections are
made in the harness using splices. The following modules are used on 2004 PT:
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Airbag Control Module
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Controller Antilock Brake
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Powertrain Control Module (Gas only)
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Engine Control Module (Diesel only)
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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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Mechanical Instrument Cluster
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Hands Free Module (if equipped)
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Satellite Radio Receiver (if equipped)
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.