For god knows what reason. A number of nissan imports have a left side, right side and headlight contact in the switch. a common fault with these is that the contacts overheat and melt the little pillars pushing them together. I had the same problem and all you need to do is install a relay somewhere along the line before the switch and melt a tiny amount of solder between the contacts to compensate for the length that the pillars were melted. Make sure when you are done you plug it back in and test it, if you put too much solder in the lights wont turn off at all.