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Head-Up Display (HUD) Image Height Adjustment 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.
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 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. Operate HUD DISPLAY button upward and downward to move image up and down on windshield. If display does not move up and down, go to next step. If display moves up and down, go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS.
  4. Access rear of HUD display switch connector but do not disconnect. Backprobe HUD display switch between terminal No. 9 (Gray wire) and ground. See WIRING DIAGRAMS  . If display moves up, go to next step. If display does not move up, go to step  7 .
  5. Backprobe HUD display switch between terminal No. 8 (Orange wire) and ground. If display moves down, go to next step. If display does not move down, go to step  7 .
  6. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on. Move HUD display dimmer switch to maximum position. Operate HUD display button upward and downward to move image up and down on windshield. If display moves up and down, go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS. If display does not move up and down, go to step  12 .
  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  13 . If circuits are okay, go to next step.
  8. Check HUD wiring harness between HUD unit and IPC for an open or short to ground condition. If faulty circuit is found and repaired, go to step  13 . If circuits are okay, go to step  11 .
  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  13 . 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  13 .
  11. Replace HUD unit. See HEAD-UP DISPLAY (HUD) UNIT  under REMOVAL & INSTALLATION. After repairs, go to step  13 .
  12. Replace IPC assembly. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  13. 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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