Home >> Land Rover >> 2017 >> Discovery SE >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: HVAC Control Module (HVAC) -- Discovery/L462 >> Diagnostic Trouble Code Index DTC: HVAC Control Module (HVAC) >> Description And Operation >> DTC B12B1-12: Heated Washer Jet and Wiper Park Relay - Circuit short to battery >> Possible Causes