Home >> Jaguar >> 2015 >> XKR-S 2D Convertible >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Audio Control Module (ACM) -- XK/X150 >> Diagnostic Trouble Code Index DTC: Audio Control Module (ACM) >> Description And Operation >> Audio Control Module [ACM] >> DTC B1A04-1A: Speaker #4 - Circuit resistance below threshold >> Possible Causes