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Originally Posted by cdm5go
I was able to add rear fog lights to my US Spec 2006 325i simply by adding the euro spec headlight switch (with the rear foglight switch) It uses the lights for the adaptive rear brake lights when switched on. So there is no adaptive function when rear foglights are on. That was all I had to do. I wonder if the x3 with adaptive brakelights is similar? Does anybody know? maybe we won't need an LCM. Does the e90 have an LCM? Forgive me if I sound naive, but electrical engineering is not my thing.
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All BMWs have an LCM. That's the light control module.......without it the light switches wouldn't work properly.
The reason your trick above works on an E90 (i know of this trick too) is because the lights are already installed and work as the adaptive brake lights. On the X3, this is not the case. The adaptive brake lights under the "C-shaped" light that normally works as the brake light. It's documented in your owner's manual. However, the rear foglights are on the round lights on trunklid itself. Thus, they are seperate from the adaptive brake lights.