PCI Bus System

The Programmable Communication Interface (PCI) bus system consists of a single wire. PCI bus is read from Data Link Connector (DLC) connector terminal No. 2 (Yellow/Violet wire). The Body Control Module (BCM) acts as a splice to connect each module and DLC. Each module uses its local ground as bus reference. If more than one module is trying to access the PCI bus at one time, code being sent determines which message has higher priority, and is then allowed to access bus first. Communication over the bus is essential to proper operation of vehicle on-board diagnostic systems and DRB.

System along the PCI bus system include:

• Powertrain Control Module (PCM).
• Body Control Module (BCM).
• Memory/Heated Seat Module (MHSM, MSM or HSM).
• Sentry Key Immobilizer Module (SKIM).
• Transmission Control Module (TCM).
• Electro/Mechanical Instrument Cluster (MIC).
• Driver's Door Module (DDM) and Passenger's Door Module (PDM).
• Air bag Control Module (ACM).
• Anti-Lock Brake Module (ABS).
• Electronic Vehicle Information Center (EVIC).
• Automatic Zone Control Module (AZC).