I had a iPod interface installed at BB for my old Accord. I first had to convince them that it was designed my car (which it was) because they had failed to do the install with this product on other accords. They got it to work, but I later figured out that they hooked it up incorrectly because it drained the battery. If I did not drive the car once a week it would not start. I put a new battery in it and traded it in. Never go to Best Buy for an install, especially with a BMW.
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