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I have a 2010 e90 & as far as I'm aware the bluetooth goes on with the ignition & no way to switch it off. When the car Bt in "pairing mode", which is activated on the car by instructing it to pair (phone/Bluetooth devices/pair (or similar), the car Bt just becomes visible to the phone - the searching / pairing is done from the phone, Once the phone finds the car it goes through the handshaking & authorising proceedures & then done
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