For the non hybrid version the philips set I mentioned that I bought would just be powered from a 12vdc source in the engine compartment. I have the hybrid version so it had to get power from a spot in the fuse box in the cabin that only gets 12vdc when the car is powered on. Since mine had the extra step of finding a spot I just went to a car audio place and had them put them in.
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Here is my JX35 with LED day running lights installed by the dealer in Bahrain. They're very cool. They run very bright at daytime, and dim a little when the headlights are on at night.
Yes it was somewhat of a major job, and I imagine that they did remove the bumper to make the cutout for the LEDs. The surrounding plastic is of the same color as the car, and it looks very professional and original. It'd better be or I wouldn't have paid close to $590 for the whole thing.
Anybody figure out why Infiniti was too cheap to use factory LED's when even the base Rogue gets them. Get with the program Infiniti.... Yes, I still love my JX but factory LED's should have been a no brainer.