Grand Cherokee 4WD V8-4.7L (2003)
Body Control Module: Description and Operation
System Description
IDENTIFICATION OF SYSTEM
The vehicle systems that are part of the "body" system are:
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Airbag
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Audio
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Chime
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Communication
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Electrically heated system
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Exterior lighting
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Heating and A/C
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Instrument Cluster
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Interior Lighting
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Memory Seat
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Electronic Vehicle Information Center
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Power Door Lock/RKE
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Power mirrors
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Power sunroof
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Power windows
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Tire Pressure Monitoring (TPM)
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Vehicle theft security system (VTSS)
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Windshield Wiper and Washer
SYSTEM DESCRIPTION
The body system on the 2003 WJ/WG consists of a combination of modules that communicate over the PCI bus (Programmable Communication
Interface multiplex system). Through the PCI bus, information about the operation of vehicle components and circuits is relayed quickly to the
appropriate module(s). All modules receive all the information transmitted on the bus even though a module may not require all information to
perform it's function. It will only respond to messages "addressed" to it through a binary coding process. This method of data transmission
significantly reduces the complexity of the wiring in the vehicle and the size of wiring harnesses. All of the information about the functioning of all the
systems is organized, controlled, and communicated by the PCI bus, which is described in the Communication of this general information.
