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Head-Up Display (HUD) Does Not Match Instrument Cluster Readings

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. If HUD display speedometer reading indicates "- -" for longer than 3.5 seconds, go to step  5 . If HUD display speedometer reading does not indicate "- -" for longer than 3.5 seconds, go to next step.
  4. If HUD display matches instrument cluster readings, go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS. If HUD display does not match instrument cluster readings, go to step  7 .
  5. Perform INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. If instrument cluster operates properly, go to step  7 . If instrument cluster does not operate properly, go to next step.
  6. Turn ignition off. Reconnect all disconnected components and connectors. Turn ignition on. Move HUD display dimmer switch to maximum position. If HUD display matches instrument cluster readings, go to HEAD-UP DISPLAY (HUD) SYSTEM CHECK  under SYSTEM TESTS. If HUD display does not match instrument cluster readings, go to step  9 .
  7. Check HUD wiring harness between HUD unit and IPC for an open or short to ground condition. See WIRING DIAGRAMS  . If faulty circuit is found and repaired, go to step  10 . If circuits are okay, go to next step.
  8. Replace HUD unit. See HEAD-UP DISPLAY (HUD) UNIT  under REMOVAL & INSTALLATION. After repairs, go to step  10 .
  9. Replace IPC assembly. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  10. 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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