Symptom: PCI Bus Communication

When Monitored and Set Condition: 

When Monitored: Ignition ON, every 7 ms.

Set Condition: When the CAB does not receive a message from the instrument cluster for 10 seconds.

POSSIBLE CAUSES 

1. CHECK COMMUNICATION TO MIC
2. CAB-- INTERNAL FAULT

Fig 1: Test Chart - PCI Bus Communication Failure

Courtesy of DAIMLERCHRYSLER CORP.