I tried to do the mod by swapping the light switch, but the auto-light-on function does not work. When you switch to 'auto' position, the park light and low beam go on, just like you turn it to low beam on position, and it stays on whenever you are in sunlight or in tunnel. It also gets warning in the cluster of 'light on' when you pull out the key if you keep the switch position at auto position. I compared with vehicles with auto light function and found that I have to replace my rain sensor with rain and light sensor, doing this I must replace a new windshield glass. No idea if the light control module must be replaced. NO idea either if it works even I replace both rain and light sensor and the light control module, it may need to recode the LCM or maybe some other module also need to be recoded. I gave it up already since it is too complicated.

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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.