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Test O: Head-Up Display Image Adjustment Inoperative

  1. If IPC diagnostic system check was performed, go to next step. If IPC diagnostic system check was not performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing IPC diagnostic system check, go to next step.
  2. 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, problem may be intermittent. To diagnose intermittent, go to INTERMITTENT TROUBLE CODE DETERMINATION in BODY CONTROL MODULES - CORVETTE article.
  3. Turn ignition off. Disconnect HUD display connector. See HEAD-UP DISPLAY UNIT  under REMOVAL & INSTALLATION. Connect test light between HUD display connector terminals No. 2 (Gray wire) and No. 7 (Black wire). Turn ignition on. Operate HUD DISPLAY button upward. If test light illuminates, go to next step. If test light does not illuminate, go to step  5 .
  4. Connect test light between HUD display connector terminals No. 1 (Orange wire) and No. 7 (Black wire). Turn ignition on. Operate HUD DISPLAY button downward. If test light illuminates, go to step  9 . If test light does not illuminate, go to step  6 .
  5. Check for open or high resistance in Gray wire between HUD display and IPC. Check for open or high resistance in Gray wire between HUD switch and IPC. Repair as necessary. After repairs, go to step  12 . If circuits are okay, go to step  7 .
  6. Check for open or high resistance in Orange wire between HUD display and IPC. Check for open or high resistance in Orange wire between HUD switch and IPC. Repair as necessary. After repairs, go to step  12 . If circuits are okay, go to next step.
  7. Check for poor connections at HUD switch. Repair as necessary. After repairs, go to step  12 . If connections are okay, go to next step.
  8. Replace HUD switch. See DRIVER INFORMATION CENTER & HEAD-UP DISPLAY CONTROL SWITCHES  under REMOVAL & INSTALLATION. After repairs, go to step  12 .
  9. Check for poor connections at HUD display. Repair as necessary. After repairs, go to step  12 . If connections are okay, go to next step.
  10. Replace HUD display. See HEAD-UP DISPLAY UNIT  under REMOVAL & INSTALLATION. After repairs, go to step  12 .
  11. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to next step.
  12. Recheck system operation to verify the repair. If system operates properly, repair is complete. If system does not operate properly, go to step  2 .
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