Home >> Jaguar >> 2021 >> XF S >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Common Specs & Procedures >> General Information - Diagnostic Trouble Code (DTC) Index (BCM - LWB - DSM/PSM) -- XF/(X260) >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Body Control Module [BCM] - LWB (G1963751) >> DTC B1D00-86: Left Low Beam - Signal invalid >> Possible Causes