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Base Cluster

WARNING: This page is about a different car, the 1996 Oldsmobile Ninety-Eight and 1996 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect instrument cluster connector. Put headlight switch in PARK or HEAD position. Put dimmer switch in LO position. Check for good terminal contact at instrument cluster connector terminal C5 (Ninety Eight) or terminal B4 (Park Avenue) and repair as necessary.
  2. If terminal contact is okay, measure voltage at Gray wire between ground and instrument cluster connector terminal C5 (Ninety Eight) or terminal B4 (Park Avenue) while adjusting dimmer control. If voltage varies with dimmer control, replace instrument cluster.
  3. If voltage does not vary with dimmer control, connect test light between voltage and instrument cluster connector Gray wire at terminal C5 (Ninety Eight) or terminal B4 (Park Avenue). If test light lights, repair short to ground in Gray wire. If test light does not light, check for open circuit in Gray wire and repair as necessary. If circuit is okay, replace headlight switch.
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