Home › Jaguar › 2010 › XJ Base › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) -- XJ/X351 › DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Automatic Temperature Control Module (ATCM) › Description And Operation › Automatic Temperature Control Module (ATCM) › DTC B10AF-13: Blower Fan Relay - Circuit open › Possible Causes