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My car has Comfort Access, but I can't say I have ever tried what you propose. My understanding is that if you leave a key in or even near the car, it will not "go into sleep mode" and thus will have an even larger battery drain than the car has already.
I don't think it will let you lock a key in the car. I am happy to give it a try once I get home from my current business trip tomorrow night. You have piqued my curiosity.
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'11 328! Touring - Tasman on Chestnut, 6spd manual, factory upside-down "i" option
'11 128i Convertible - Space Gray on Savannah Beige, 6spd manual,
also '14 Mercedes-Benz E350 wagon, '95 Land Rover Discovery, '74 Triumph Spitfire |