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Instrument Panel Illumination Inoperative

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Connect scan tool to DLC. Locate ambient light sensor at top of Driver's Information Center (DIC) buttons and cover with Black electrical tape. See Figure . Select IPC data display on scan tool and monitor ambient light sensor counts. If counts are less than 5, go to next step. If counts are greater than 5, go to step  9 .
  3. Remove Black electrical tape and monitor ambient light sensor counts. If counts are 5-255, go to next step. If counts are greater than 255, go to step  9 .
  4. Turn headlights or parking lights on. Rotate instrument panel dimmer knob to minimum brightness position. See Figure . Monitor switch dimming data counts on scan tool. If counts are 5 or less, go to next step. If counts are 5 or more, go to step  8 .
  5. Rotate instrument panel dimmer knob to maximum brightness position. See Figure . Monitor switch dimming data counts on scan tool. If counts are 220-255, go to next step. If counts are not 220-255, go to step  8 .
  6. Turn headlights or parking lights on. With ambient light sensor covered, rotate instrument panel dimmer knob to maximum brightness position. If gauge backlight comes on, go to next step. If gauge backlight does not come on, go to step  11 .
  7. If driver's information center control or head-up display controls light up, go to step  10 . If driver's information center control or head-up display controls do not light up, go to step  11 .
  8. Replace head-up display switch/dimmer switch assembly. See DRIVER INFORMATION CENTER (DIC) & HEAD-UP DISPLAY (HUD) CONTROL SWITCHES  under REMOVAL & INSTALLATION. After repairs, go to step  12 .
  9. Replace driver's information center control containing ambient light sensor. See DRIVER INFORMATION CENTER (DIC) & HEAD-UP DISPLAY (HUD) CONTROL SWITCHES  under REMOVAL & INSTALLATION. After repairs, go to step  12 .
  10. Replace inoperative driver's information center control or head-up display controls. See DRIVER INFORMATION CENTER (DIC) & HEAD-UP DISPLAY (HUD) CONTROL SWITCHES  under REMOVAL & INSTALLATION. After repairs, go to step  12 .
  11. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  12. Turn ignition off and reconnect all disconnected components and connectors. Turn ignition on. Go to INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
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