I have just fixed one of these with the same problem.Firstly swap over the bulb and connector box with the left side.This can be done with the headlight in situ.If the r/hand headlight is still a problem,then the ballast/ignition unit will be faulty.Headlight needs to come out for access(bumper off/released).It is the Hella unit attached to the base of the light assy.Around £300 from dealer.