Section 938 (Electronic Control Modules): Communication: Description

The Programmable Communication Interface (PCI) data 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.

The modules used include:

• Body Control Module
• Integrated Power Module (IPM)
• Next Generation Controller (NGC)
• Instrument Cluster (IC)
• Electronic Vehicle Information Center (EVIC)
• Occupant Restraint Controller (ORC)
• Compass/Mini-Trip (CMTC)
• Overhead Console
• Controller Antilock Brake (CAB)
• Automatic Temperature Control Module (ATC)
• Power Liftgate Module (PLGM)
• Radio
• CD Changer
• Memory/Heated Seat Adjustable Pedal Module
• Sentry Key RemotE Entry Module (SKREEM)
• Driver Door Module (DDM)
• Passenger Door Module (PDM)

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.