Hi all! I am planning to install the automatic headlight adjustment control system to my xenon headlight that is retro-fitted one year ago. Now I have all the parts in hand:

1. unit control for headlight aim control (part number: 61358375964)
2. one level sensor (part number: 37141093699)
3. control element light/headlight switch (part number: 61318380255)
4. Left and right xenon headlights with HID bulbs and ballasts

My X5 is 2001 made 4.4i with rear axle self-level system. Below is my question:

1. how many level sensors do I need for front axle? Only one for passenger side or two for both side? According to the BMW official instruction posted in the homepage, only one for passenger side is needed, is it right?
2. Does anyone know the part number for all harness? I am going to buy all the harness required in the instruction from the dealer.
3. what else do I need for this installation?
4. do I need to code my car after installation?

Thanks for help!!!

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.