Home › Jaguar › 2012 › XK 2D Convertible › Repair and Diagnosis › Restraints › Restraints Control Systems › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- XK/X150 › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) › Description And Operation › Restraints Control Module [RCM] › DTC B1D77-1A: Right Roll Over Protection System - Circuit resistance below threshold › Possible Causes