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.
Head-Up Display (HUD) System Check
- Connect scan tool to DLC. Establish communication with IPC. If scan tool communicates with IPC and no IPC DTCs are stored, go to next step. If scan tool does not communicate with IPC or IPC DTCs are stored, go to INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition off and back on. IPC will perform an indicator bulb check and sweep check on all gauges. If indicator lights come on and all gauges move from minimum reading to maximum reading and back to minimum reading when ignition is cycled, go to next step. If indicator lights and gauges do not operate as specified, replace IPC. Go to BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
- Turn ignition off. Set 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 under SYMPTOM TESTS.
- Press HUD DISPLAY button to up position. Press HUD DISPLAY button to down position. If display moves up and down on the windshield, go to next step. If HUD does not operate as specified, go to HEAD-UP DISPLAY (HUD) IMAGE HEIGHT ADJUSTMENT INOPERATIVE under SYMPTOM TESTS.
- Move HUD display dimmer control to OFF position. Move HUD display dimmer control to maximum setting. If display if off in OFF position and at maximum illumination with knob at maximum, go to next step. If HUD does not operate as specified, go to HEAD-UP DISPLAY (HUD) IMAGE DOES NOT DIM under SYMPTOM TESTS.
- Move HUD display dimmer control to maximum setting. Place dark fabric over ambient light sensor on HUD display unit. If display dims, go to next step. If HUD does not operate as specified, go to HEAD-UP DISPLAY (HUD) IMAGE DOES NOT DIM under SYMPTOM TESTS.
- Press and hold the PAGE button on HUD controls. Display should scroll through the following display modes:
- Speedometer
- Speedometer And Gauges
- Speedometer, Tachometer And Gauges
- Speedometer And Tachometer
- Tachometer
When in this mode, readings should match the instrument cluster. If functions operate as described and match instrument cluster readings, go to next step. If HUD does not operate as specified, go to HEAD-UP DISPLAY (HUD) DOES NOT CHANGE DISPLAY MODES or HEAD-UP DISPLAY (HUD) DOES NOT MATCH INSTRUMENT CLUSTER READINGS under SYMPTOM TESTS.
- Set HUD display to either speedometer and gauges or speedometer, tachometer and gauges. Press and release PAGE button to scroll through following gauge readings:
- Oil Pressure
- Coolant Temperature
- Fuel
When in this mode, readings should match the instrument cluster. If functions operate as described and match instrument cluster readings, HUD is operating properly. If HUD does not operate as specified, go to HEAD-UP DISPLAY (HUD) DOES NOT CHANGE DISPLAY MODES or HEAD-UP DISPLAY (HUD) DOES NOT MATCH INSTRUMENT CLUSTER READINGS under SYMPTOM 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.