Hi mate, I had a similar problem. And solved it just now!
I just replaced the spiral cable, (also known as airbag rotary) which is located just behind the steering wheel and all is good.
These cost £91 from Nissan which is not too bad! When connecting it, make sure the steering wheel is aligned straight and don't fiddle with it too much. Ohh, also make sure the battery is disconnected when removing the airbag!
If you have any trouble, Im sure Lee wont mind talking you through it!