call and ask them to explain it to you, I called before and they were clueless , if it really works , I want one

the BMW X5 has a central bus system that controls basically everything... you can probably tap into it anywhere and they picked this area for ease of access.

at $200 I'd try to get a dealer or specialty shop to recode it for way less.

BMW electronic systems that are redundant to the nuts and communicate between them, that's what it has to do with the rain sensor.
Here is a true story, from my e39:

The car started to randomly lock the doors, turn the flashers on and the dome light on for no apparent reason. GT1 didn't reveal anything abnormal. My car is equipped with auto lights AND rainsensor. This started to happen in fall, when I drove mostly with the headlights on (going to and from work - dark). Then, in spring I noticed this symptom would happen only when the auto lights would turn on.
So I swapped one ballast (I was lucky to pick up the right one), and the issue I had for over 7 months was solved!!!! I was told that the LCM was faulty (expensive repair/replacement with necessary coding), that the air bag module is faulty (crash recognition program), etc. The reason I didn't do any of these was because the GT1 didn't give ANY errors. Even after the symptom was starting and hooked on to the GT1. So maybe something wasn't right in the electronics of that ballast, and every time it was turned on, it created maybe some sort of weird power frequency that would trigger the crash recognition program (minus deployed airbags thank God). Because LKM & IKE & GM & God knows what else are communicating between them, and one little buggered up signal is picked by one of the modules and translated wrongly to give you headaches.

So, having that "module" by the rain sensor, is probably giving some sort of signal in the cascade of modules, which interpret the message as "the air ride is working OK".

I hate to bump an old thread, but does anyone know a dealer or INDY in the Bay Area (CA) from San Jose/San Francisco/Oakland/Sacramento/Modesto that can rid me of this error?

Following. I am on the fence to fix/swap my front struts for 1400$ parts and labor w/ Alignment or completely ditch Air suspension with one of the kits in the market. The key is to how to code the car so no warnings are triggered.

do you have a link to any of the kits, I've only found one and I'm not really thrilled with it

I found strutmasters kit for 1699 and saw couple of forum members tried it already, but the error message stayed even after using a special module.

Looks like there is an updated module on the way but no idea on timeline and unsure of guaranteed error message suppression on long term basis.

The e53 BC Coilover kit is absolutely fantastic and definitely prefer it over my 4.8is air suspension. That being said, this thread is testament that a solution exists but I haven't seen anyone else have any luck with a dealer or INDY on the West Coast. I don't see any point on trying out a "module" when the dealer can fix it in 1 hour if they only have the "know how."

Since it doesn't look as though anyone found a solution to this 7 years old post, I thought I'll post a solution.

Get a copy of PA Soft BMW Scanner 1.4 and you can code your BMW to turn off the error light.

$30, easy peasy. Post #13.
http://www.xoutpost.com/bmw-sav-foru...-delete-2.html