Home >> Land Rover >> 2021 >> Defender 90 X >> Repair and Diagnosis (Single Page) >> General Information >> Specifications Index >> Diagnostic Trouble Code Index DTC: Rear HVAC Control Module (RHVAC) - With Rear Air Conditioning -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Rear HVAC Control Module (RHVAC) - With Rear Air Conditioning (G2400910) >> Description And Operation >> Rear HVAC Control Module (RHVAC) - With Auxiliary Climate Control >> DTC B1DA7-11: Right Third Row Seat Heat Switch Pack - Background Illumination - Circuit short to ground >> Possible Causes