Home › Land Rover › 2022 › Defender 90 X-Dynamic HSE › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: HVAC Control Module (HVAC) -- Defender/L663 › Diagnostic Trouble Code Index - DTC: HVAC Control Module (HVAC) (G2400894) › Description And Operation › HVAC Control Module (HVAC) › DTC B1419-49: Left Rear Cooled/climate seat Control Module - Internal electronic failure › Possible Causes