Head Up Display Unit: Troubleshooting

Category	Error symptoms	inspection item	Detailed inspection item	Related parts
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 cluster USM → If working, HUD has no problem. Check the ambient light sensor operation → If the ambient light sensor works, check the communications (BCM ↔ HUD)	Light sensor BCM Cluster
Adjustment function	Display position not adjusted	Check the mirror movement when IG is on or off (parking position)	If the step motor does not work when IG is on or off, → The step motor in HUD fails. If the step motor in HUD works when IG is on or off, → Check the CAN communications (cluster ↔ HUD)	HUD Cluster