Home › Land Rover › 2015 › LR2 Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATC) -- LR2/L359 › Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATC) › Description And Operation › DTC B1030-4B: Left Front Seat Heater - Over temperature › Possible Causes