Airbag light stays on

I have an 06 trd off road that had its interior vandalized. One of the things I had to replace was the instrument cluster with one from a junk yard. The airbag light stays on all of the time. I had a friend scan the computer and clear several codes but code b1816 remained. basically it is saying there is a short in the front or left side wiring or possibly a bad connection at the cluster pin connectors. I checked all of the wiring i could for anything obvious but found nothing.I then plugged in the old cluster and the airbag light did not come on. Plugged in the new cluster and the light on that one was on. Seeing as the new cluster was out of a wreck, I am wondering if there is something in the new cluster that needs to be reset? maybe an autobody tech would be familiar with this?