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Head-Up Display (HUD) Image Does Not Dim

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.
NOTE: Diagnosis of any HUD malfunctions must always begin with verifying proper IPC operation. See INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  1. If Head-Up Display (HUD) system check has been performed, go to next step. If Head-Up Display (HUD) system check has not been performed, see HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS.
  2. Turn ignition off. Move HUD display dimmer switch to maximum position. See Figure . Turn ignition on. If all segments of HUD display on windshield come on and turn off in 3.5 seconds, go to next step. If HUD does not operate as specified, go to HEAD-UP DISPLAY (HUD) INOPERATIVE  .
  3. Move HUD display dimmer switch down to dim the display on windshield. If display dims, go to next step. If display does not dim, go to step  5 .
  4. Move HUD display dimmer switch to maximum position. Cover ambient light sensor located on HUD unit with dark fabric. Wait 5 seconds. If HUD display dims with ambient light sensor covered, go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS. If HUD display does not dim with ambient light sensor covered, go to step  8 .
  5. Disconnect HUD display switch connector. If display does not turn off, go to step  7 . If display turns off, go to step  9 .
  6. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on. Move HUD display dimmer switch to maximum position. Move HUD display dimmer switch down to dim the display on windshield. If display dims, go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS. If display does not dim, go to step  11 .
  7. Check HUD wiring harness between HUD display switch and IPC for an open, short to voltage or short to ground condition. See WIRING DIAGRAMS  . If faulty circuit is found and repaired, go to step  12 . If circuits are okay, go to next step.
  8. Check HUD wiring harness between HUD unit and IPC for an open, short to voltage or short to ground condition. If circuits are okay, go to step  11 . If faulty circuit is found and repaired, go to step  12 .
  9. Check HUD wiring harness between HUD display switch and IPC for an open, short to voltage or short to ground condition. If faulty circuit is found and repaired, go to step  12 . If circuits are okay, go to next step.
  10. Replace HUD display switch. See DRIVER INFORMATION CENTER (DIC) & HEAD-UP DISPLAY (HUD) CONTROL SWITCHES  under REMOVAL & INSTALLATION. After repairs, go to step  6 .
  11. Replace HUD unit. See HEAD-UP DISPLAY (HUD) UNIT  under REMOVAL & INSTALLATION. After repairs, go to step  6 .
  12. Turn ignition off and reconnect all disconnected components and connectors. Recheck system operation. Go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS.
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