Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1999CORVETTE 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ANALOGSYMPTOM TESTSHEAD-UP DISPLAY (HUD) IMAGE DOES NOT DIM
1999 Chevrolet Corvette 2D Coupe, Standard
Head-Up Display (HUD) Image Does Not Dim
1999 Chevrolet Corvette 2D Coupe, StandardSECTION Head-Up Display (HUD) Image Does Not Dim
- Perform HEAD-UP DISPLAY (HUD) SYSTEM CHECK under SYSTEM TESTS. Go to next step.
- 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 .
- 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 .
- 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 .
- Disconnect HUD display switch connector. If display turns off, go to step 9 . If display does not turn off, go to step 7 .
- 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 .
- Check HUD wiring harness between display switch and IPC for an open or short condition. If faulty circuit is found and repaired, go to step 12 . If circuits are okay, go to next step.
- 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 12 . If circuits are okay, go to step 11 .
- Check HUD wiring harness between display switch and IPC for an open or short condition. If faulty circuit is found and repaired, go to step 12 . If circuits are okay, go to next step.
- Replace HUD display switch. See DRIVER INFORMATION CENTER (DIC) & HEAD-UP DISPLAY (HUD) CONTROL SWITCHES under REMOVAL & INSTALLATION. After repairs, go to step 6 .
- Replace HUD unit. See HEAD-UP DISPLAY (HUD) UNIT under REMOVAL & INSTALLATION. After repairs, go to step 6 .
- 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.