Diagnosis And Testing - Instrument Cluster
To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.
On vehicles equipped with the high voltage system, disconnecting the 12-volt battery negative cable alone will not power down the 12-volt system. You must perform the 12-volt Power Down procedure before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
On vehicles equipped with the high voltage system, power down the 12 volt system. Refer to ELECTRIC VEHICLE CONTROL SYSTEM, STANDARD PROCEDURE .
If all of the Instrument Cluster (IC) (also known as the Instrument Panel Cluster/IPC) gauges and indicators are ineffective, be certain to check the IC fused B(+) fuse and the IC fused B(+) circuit and ground circuit for shorts or opens. The hard wired circuits between components related to the IC may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin out information and location views for the various wire harness connectors, splices and grounds.
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the IC or the electronic controls or communication between modules and other devices that provide some features of the IC. The most reliable, efficient and accurate means to diagnose the IC or the electronic controls and communication related to IC operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.