Home >> Land Rover >> 2021 >> Defender 110 S >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Head Up Display (HUD) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Head Up Display (HUD) (G2400895) >> Description And Operation >> Head Up Display Control Module (HUDCM) >> DTC B1A85-96: Ambient Light Sensor - Component Internal Failure >> Possible Causes