I just picked up a 03 4runner (limited 4x4) and the airbag light has been turning off and on. Sometimes it's on when I start it and other times it turns on while driving. I don't think I've seen it turn off while driving. I took it to the dealer today and said if it threw the code then they would see it because the cpu records it. Well they said they didn't find anything wrong and no codes where recorded and to my surprise within 10mins of driving away the light came back on.

Any ideas on how to better diagnose the problem?