this thread has been very helpful for me at least to figure out this feature. Thanks all for sharing your research on it.

One quick question to anyone who might know. My wife lost her key the 1st day we brought the car home! So I bought a new one and it's on the way now. Will the car recognize the new key? Does it have the ability to store 3 keys? or will I need to delete my prefs first and then re-do it with the new key?

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BMW - X5 4.8i w/all US options packages, 19" Y wheels, White/Tobacco, Huper Optik 50% tint
Mercedes Benz - E320 CDI Park Assist, NAV, Folding Mirrors, Premium Sound, Voice Command, Sunroof, Auto Rear Shade, Bi-Xenon