Chart D-1 Data Circuit Problem (Analog Cluster)

You have been directed to this chart from the "Diagnostic System Check" as a result of the Instrument Panel Cluster (IPC) voltmeter not indicating voltage. This is a result of total loss of communication on circuit 800 due to a wiring or element problem.

Notes on trouble trees
1. The ALDL cover is one of the branches of the 800 circuit, if it is off one should start diagnosis at "Self-Diagnostic System Check".
2. This step will isolate a fault in the data circuit between the ALDL cover and the programmer. If the voltmeter continues to read zero, circuits 800A, 800B, 800C, 800D, the IPC, BCM, and Computer Control Driver Information Center (CCDIC) are suspect.
3. This step will remove the problem if it is within the CCDIC or circuit 800A.
4. This will isolate circuit 800D as the problem, if the actual voltage returns.
5. This checks for a faulty IPC, or circuit 800C.
6. This final step will isolate the condition to the BCM, circuit 800C, or 800B.