IF YOU MEAN THE DIPPED BEAM BULB (CODE H7) ITS A TOTAL PAIN!! YOU HAVE TO REMOVE THE ROUND BLACK COVER ON THE BACK OF THE HEADLAMP UNIT, IT TWISTS I THINK. THEN STICK YOUR HAND INTO THE UNIT AND 'FEEL' FOR THE WIRING BLOCK, PULL OFF THE BLOCK AND 'FEEL' FOR A METAL WIRE CLIP THAT IF YOU SQUEEZE THE SIDES IT SHOULD POP OFF AT THE TOP LEAVING IT FASTEND AT THE BOTTOM. THEN YOU SHOULD BE ABLE TO GET HOLD OF THE CONTACTS AND PULL THE BULB OUT. BUT..... REMEMBER WHICH WAY UP IT GOES IN. IF YOU TAKE IT OUT CAREFULLY THERE IS A LOCATION 'LUG' AND IT WILL ONLY GO BACK IN ONE WAY. FIT THE NEW BULB, THEN YOU HAVE TO RECLIP THE METAL CLIP BACK OVER THE BACK OF THE BULB. ITS A TOTAL PAIN IN THE BUTT!! I HAD TO REPLACE OURS TWICE IN 2 WEEKS!! AND I TOOK THE CLIP OFF TOTALLY BY MISTAKE AND IT TOOK ME AGES TO GET IT BACK ON . ITS ALL 'FEEL' WORK I'M AFRAID. AND NOT GOOD IF YOU HAVE BIG HANDS EITHER. THEN OBVIOUSLY RE-BLOCK IT AND REFIT THE COVER. OR ALTERNATIVELY GET SOMEONE ELSE TO DO IT FOR YOU!! :(