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Home >> Oldsmobile >> 1998 >> Eighty-Eight LS >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Symptom Tests >> Instrument Cluster Display Does Not Dim Or Goes Blank When Parking Lights Or Headlights Are On

Instrument Cluster Display Does Not Dim Or Goes Blank When Parking Lights Or Headlights Are On

  1. Turn ignition switch to OFF position. Disconnect instrument cluster Orange 32-pin connector C2. See Figure . Move headlight switch to PARK or HEAD position. Turn dimmer control to low position. Using DVOM, check voltage between instrument cluster harness connector C2, terminal E4 (Yellow wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short to ground in circuit No. 32 (Yellow wire) between instrument cluster connector C2 and instrument panel fuse block. Recheck system operation.
  2. Check voltage between instrument cluster harness connector C2, terminal E1 (Gray wire) and ground while adjusting dimmer control. If voltage varies with dimmer control, go to step 4). If voltage does not vary with dimmer control, go to next step.
  3. Check for open, high resistance or short to ground in circuit No. 8 (Gray wire) between instrument cluster connector C2 and interior lighting system. See WIRING DIAGRAMS  . Check for poor connections at headlight switch. Repair as necessary and recheck system operation. If circuit and connections are okay, replace headlight switch. Recheck system operation.
  4. Check for poor terminal contacts at instrument cluster connector C2, terminals E4 (Yellow wire) and E1 (Gray wire). Repair as necessary and recheck system operation. If contacts are okay, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Recheck system operation.
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