Home >> Land Rover >> 2022 >> Defender 90 >> Repair and Diagnosis >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Body Control Module (BCM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Body Control Module (BCM) (G2400885) >> Description And Operation >> Body Control Module (BCM) >> DTC B1623-12: Switch Illumination Adjustment Control 5V Supply - Circuit short to battery >> Possible Causes