The instrument panel cluster (IPC) uses information from other systems in order to execute some functions. Therefore, before further diagnosis, review the general information on how the IPC operates and how each system interacts with the IPC. Refer to Instrument Cluster Description . This will prevent excessive diagnostic time, future misdiagnosis, and unnecessary parts replacement.

Use a scan tool in order to diagnose the IPC when referred to in diagnostic procedures. In addition to displaying DTCs, the scan tool displays the input status and the data values. The scan tool can also command many of the IPC display functions ON and OFF. Any of these features can be selected using the scan tool.

Replace the IPC only if the diagnostic procedures specifically direct you to do so. Every input to the IPC and every output from the IPC is short to ground/short to battery protected. Therefore, the IPC does not automatically need to be replaced when a short is found in the wiring. Repair the wiring first. Then inspect the system for further problems. Most system malfunctions are traceable to faulty wiring and connectors, and occasionally components. The IPC is very reliable and not the likely cause of a system malfunction. IPC replacement before a complete diagnosis will usually result in a recurrence of the original complaint malfunction.

Do not use a test light to diagnose the instrument cluster electrical systems unless specifically instructed by diagnostic procedures. Use the connector test adapter kit J 35616 . When diagnostic procedure require probing of connectors. Refer to Special Tools in this section.

The instrument cluster will withstand normal current draws associated with vehicle operations. Avoid overloading any circuit. When testing for opens or shorts, do not ground or apply voltage to the instrument cluster circuits unless instructed to do so. These circuits may only be tested using a Digital Multimeter (DMM) J 39200 or equivalent. Electrical circuits should be tested with a DMM J 39200 while the instrument panel cluster (IPC) connector remains connected to the instrument cluster or the recommended breakout box. Never remove or apply voltage to the instrument cluster with the key in the RUN position. Before removing or connecting battery cables, fuses or connectors always turn the key to the LOCK position. Whenever a instrument cluster removal and replacement is performed, follow the removal and replacement instructions.

Important: After a repair is made, it must be checked by operating the vehicle within the limits shown in conditions for setting the DTC, part of the DTC procedure.