Beeping when taking Key out of ignition

Hi,

I've had a micra (03 plate) for just a couple of weeks. I had a new radio fitted today (not by nissan) and now when I take the key out of the ignition I get a series of beeps and the key light keeps flashing, this continues while im sat in the car even with the key in my hand. It never used to do this. Any ideas??
 
i have got a pioneer face off and if i dont take the face off when i take the key out the ignition i get a series of beeps(beeps about 5-6 times)then stops.
 
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