I installed an aftermarket stereo in my 2008 Nissan Altima. Now my airbag light located on top of my fuel gauge has started flashing intermittenly and will not shut off even after I hook the stock stereo back up. Of course the manual refers you to the dealer for a measly $160!! I'm not paying that so they can hook up a diagnostic machine and say oh here you got a wire unhooked or something. anybody got any ideas?