Home › Land Rover › 2014 › LR4 Base, AWD › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Transmission Control Switch (TCS) -- LR4/L319 › Diagnostic Trouble Code Index DTC: Transmission Control Switch (TCS) › Description And Operation › DTC B1243-01: Winter Button Mode Indicator - General electrical failure › Possible Causes