GM Service Manual Online
For 1990-2009 cars only
    • Do not use a test lamp to diagnose the IPC electrical systems unless specifically instructed by the diagnostic procedure.
    • Use the J 35616-A when diagnostic procedures require the probing of connectors.
    • The instrument panel cluster (IPC) will withstand normal current draws associated with vehicle operation.
    • Avoid overloading any circuit.
    • Do no ground or apply voltage to the IPC circuits unless instructed to do so when testing for opens or shorts.
    • Circuits may only be tested using a J 39200 Digital Multimeter or the equivalent.
    • Test the electrical circuits with a J 39200 DMM while the IPC connector remains connected to the IPC or the recommended breakout box.
    • Do not remove or apply voltage to the IPC with the key in the RUN position.
    • Always turn the key to the LOCK position before removing or connecting battery cables, fuses or connectors.
    • Follow the removal and replacement instructions whenever you perform an IPC removal or replacement.