'03 ML500 without xenons, I want to upgrade
1. post-2002 vehicles only need to swap in the xenon bulb
2. this may be illegal due to lack of auto-leveling, which is not attainable through retro-fit
3. These bulbs are called "H7" and can be bought in a variety of places? (I need a part number and vendor still)
4. The computer may require reprogramming at the dealer to recognize the xenons.
What did I miss? Any correction/ additional info would be appreciated.
I too had a 2002 ML without factory xenons. Now, the only option whether you go with OEM Bi-Xenons or aftermarket xenons, regardless, you need to go through the diagnostic system and change the factory settings to Xenon Present, that way the car can recognize the ballasts etc.
However: Most dealerships WILL not perform this 2 second procedure, mainly because if anything goes wrong due to adding Xenon, they do not want to be held responsible. I went through 21 dealerships in the tri-state area before I gave up.
I bought a 8000k HID kit from my local speed shop, and had the installer trick the computer. Low-Beams and City Lights both use H7 bulbs, so he simply switched the low-beams into the city lights, and city lights into the low-beams which in turn got the 8000k HIDs. If we hooked up the HIDs to the low-beams the computer wouldnt recognize it however the city lights don't need to recognize it because there is no xenon option with highs. So, even when my lights are on auto or the next step above, my xenons will always be on until i cut complete power to everything going to my headlamp. Its complicated work for such a small modification.
In turn -- in order for these to work, find a dealership who will change the settings for you. It will save you time and money.

Nice writeup....Im thinking of doing this mod....but have the dealer upgrade the ecu setting to Present.
Btw...what HID kit did you use? Does power draw for the ballasts from the battery or from the lowbeam/highbeam sockets?
Thank in advance.
Pete



