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3.5 COMMUNICATION The Programmable Communication Interface or PCI Bus is a single wire multiplexed network capa- • Body Control Module • Front Control Module • Airbag Control Module • Left Side Impact Airbag Control Module • Right Side Impact Airbag Control Module • Controller Antilock Brake • Powertrain Control Module (Gas) • Engine Control Module (Diesel) • Radio • CD Changer • Transmission Control Module • Automatic Temperature Control Module • A/C Heater Control Module (MTC) • Sentry Key Immobilizer Module • Memory Seat/Mirror Module • Overhead Console • Mechanical Instrument Cluster • Left Sliding Door Control Module • Right Sliding Door Control Module • RKE/Thatcham Alarm Module (Export) • Power Liftgate Module Each module provides its own bias and termina- tion in order to transmit and receive messages. The The bus messages are transmitted at a rate averaging 10800 bits per second. Since there is only t lab scope. The 12v square wave selection on the 20-volt scale provides a good view of The PCI Bus failure modes are broken down into two categories. Complete PCI Bus Communication Symptoms of a complete PCI Bus Communication Failure would include but are not limited to: • All gauges on the MIC stay at zero • All telltales on MIC illuminate • MIC backlighting at full intensity • Dashed lines in the overhead console ambient • No response received from any module on the PCI • No start (if equipped with Sentry Key Immobi- Symptoms of Individual module failure could include any one or more of the above. The difference t. Diagnosis starts with symptom identification. If a complete PCI Bus Communication Failure is sus- t. If any modules are responding, the failure is not related to t may display “BUS +/- SIG- NAL OPEN” or “NO RESPONSE” to indicate a t and in no way indicates whether or not the PCI bus is operational. 11 GENERAL INFORMATION |