Head Up Display (HUD) System: Troubleshooting

Item	Symptoms	Check List	Detail	Components
Lighting	HUD not working Lighting brightness not automatically controlled (no difference between day and night)	Check the lighting control Check the ambient light sensor operation Check the CAN communication	Check the lighting control in the AVNT USM → If working, HUD has no problem. Check the ambient light sensor operation → If the ambient light sensor works, check the communications (CGW ↔ HUD)	Illumination sensor CGW Cluster
Adjustment function	Not adjusted	Check the mirror movement when IG ON or IG OFF (Parking position)	If the step motor does not work when IG ON or IG OFF → The step motor in HUD fails If the step motor in HUD works when IG ON or IG OFF → Check the CAN communications (AVNT ↔ HUD)	AVNT