A Preliminary Information

The instrument cluster uses information from other systems in order to deliver information to the driver. Review the general information on the following items before further diagnosis:
^ How the instrument cluster computer system operates
^ How each system interacts with the instrument cluster

This step may prevent the following conditions from occurring:
^ Lost diagnosis time
^ Future misdiagnosis
^ Unnecessary parts replacement

Use a scan tool in order to diagnose the instrument cluster when referred to the instrument cluster in diagnostic procedures. In addition to displaying Diagnostic Trouble Codes (DTCs), the scan tool display may display the following information:
^ The input status
^ The data values used

The scan tool may also cycle many of the following components both on and off.
^ The indicators
^ The gauges

Any of these features may be selected using the scan tool.

Become very familiar with the following instrument cluster information:
^ The capabilities
^ The diagnostic features

The self-diagnostic features are referenced in the DTC tables. These features are very useful in diagnosing non-DTC setting malfunctions as well. Not all circuits that feed information to the instrument cluster will set a code if the fault exists within that circuit. The following circuits will not set a trouble code:
^ The windshield washer solvent level switch input
^ The engine coolant level indicator module switch inputs

The diagnostic tables concerning these circuits are still included within this cell in order to help locate the concerns. Perform the Instrument Cluster Diagnostic System Check, these tables will assist in diagnosis. Replace the instrument cluster only if the diagnostic procedures specifically direct you to do so. The instrument cluster does not automatically need to be replaced when a short is found in the wiring. Repair the wiring first. Inspect the system for further concerns. Most system malfunctions are traceable to one of the following conditions:
^ Faulty wiring
^ Faulty connectors
^ Faulty components

The instrument cluster is very reliable. The instrument cluster is usually not the cause of a system malfunction. Replacing the instrument cluster before a complete diagnosis will usually result in a recurrence of the original complaint.