Instrument Cluster Inoperative

Instrument Cluster Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

Voltage is supplied to the instrument panel cluster (IPC) through the battery voltage circuit and the RUN/CRANK relay voltage circuit. The IPC will operate when the RUN/CRANK relay voltage circuit is commanded on in the RUN/START position.

Circuit/System Testing

1. Ignition OFF, disconnect the IPC.
2. Ignition ON, verify that a test lamp illuminates between the following appropriate RUN/CRANK relay voltage circuit and a ground.

* Terminal 2 Cadillac
* Terminal 5 Chevrolet/GMC

• If the test lamp does not illuminate, repair the RUN/CRANK voltage circuit for a short to ground or an open/high resistance.

3. Verify that a test lamp illuminates between the following appropriate RUN/CRANK relay voltage circuit and appropriate IPC ground circuit.

* Terminal 2 and 5 Cadillac
* Terminal 5 and 13 Chevrolet/GMC

• If the test lamp does not illuminate, repair the IPC ground circuit for an open/high resistance.

4. If all circuits test normal, replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests