Is there a button or something on the wiimote that needs to be pressed? If there is, you could try pressing that if you didn't press it at all. I say you might have to do that if there's a button since the PS3 controller is the only bluetooth device I've ever known (of the 3 bluetooth devices I've ever known) that tried pairing automatically.
in a perfect world we would all be piles of sand with no ability to form coherent bodies of body