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Remove the pairing in your car system and then perform the pairing again. Check your car manuals for instructions.
I have a 800 however it just will not pair with a Mercedes Audio 20 unit. The phone just keeps searching, I left it doing this for 30 minutes. I have tried turning it off then on, and a whole load of other varients of this ith no luck, any ideas?
Did you set the bluetooth unit in your car to pairing mode? You need to do so before the phone will find it. You need to refer to the car manual on instuctions to set it to pairing mode.