Airbag light

I have a 2008 Nissan sentra and the airbag light will not stop blinking. The first time it came on I took it in to Nissan they said there was nothing wrong and just rest the computer. Its back on so I went to youtube and tried the ignition on off trick. It didn't work its still blinking. I did get a blink code..the light is solid for 3 or 4 sec off for 2, 3 short blinks then off for 2 and it repeats. What does it mean or what do I do? I cant find the codes anywhere.