Coupling via Bluetooth in Cabrio 325 Ci

I just got a my new BMW Cabrio 325Ci that came with Bluetooth. I tried coupling my Motorola V525, but couldn't get the Bluetooth to activate in the
car. I followed the instructions of putting the key into the ignition (position 0) and pressing the hands-free button for 3 secs, but nothing ever happened.
Do I need to activate/check anything else, before Bluetooth searches for devices in the vicinity?

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