Home › Jaguar › 2014 › XJR L › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code (DTC) Index DTC: TELEMATIC Control Module (TCU) -- XJ/X351 › Diagnostic Trouble Code (DTC) Index DTC: Telematic Control Module (TCU) › Description And Operation › TELEMATIC Control Module (TCU) › B1A01-01 Speaker #1 - General Electrical Failure › Possible Causes