I have experienced exactly the same issue before, I followed the 350Z video linked in the last few posts, and the issue cleared fine, but came back a few days later.
Is there any more permanent fix for this however? I've got my MOT coming up and part of me wants to chance it with the reset procedure, but the other half of me wants to fix it if there is genuinely something wrong with the Airbag System as I use this car as my daily driver, therefore the light does get annoying after a while.