System Check Chart A: Cluster Display Problem
You have been directed to this chart from the "SELF DIAGNOSTIC SYSTEM CHECK " as a result of an odometer reading of "0" or "Error" on a digital cluster or a volt gauge reading of "8" on an analog cluster.
NOTE:
The following step numbers refer to circled numbers on diagnostic chart. See Fig 1
. For circuit identification, see Fig 2
.
- The ALDL cover is one of the branches of the 800 circuit. If it is off, it should be reinstalled and diagnosis should begin again at the "SELF DIAGNOSTIC SYSTEM CHECK ".
- If the odometer displays all zeros, then a loss of serial data is indicated and the fault is diagnosed in SYSTEM CHECK CHART D: DATA CIRCUIT PROBLEM . If ERROR is displayed, the fault is either in the IPC or the BCM EPROM.
- This step will prevent communication between the BCM and IPC. If the odometer now reads zero miles, then the "Error" display was originating in the BCM and is caused by the BCM EEPROM. If the odometer now reads "Error" then the IPC is the problem.
- This will determine whether the Combo Panel is affected by the problem being diagnosed. If so, then it must be a communication problem. If not, then the problem is isolated to the IPC or its power and ground circuits.