Ok friends, let me give you my experience with this problem!

We have a 01 Tahoe that had this problem. VERY enoying! It was always my wife that it locked up on. But that is just because if we are not in the AV and I am driving, then we are in her Tahoe and I am driving

, (kind of a pattern there huh)
Ok, We have been complaining about this problem to our service writer for over a year, well I guess since the second time it happened, which would be soon after we got the truck. The lady at Cumbie Chevrolet in Moncks Corner SC. insisted that this is a safety feature. We called Bull-sh** on that. When we bought the Tahoe I had a 2000 Silverado, with the same seats. Never had this happen. She just said "I don't know what to tell you"

Finally about a month and a half ago, I was tired of hearing my wife complain about it. We brought it back to the dealer and told her of the problem again, same answer. I told her that was CRAP!and I wanted to speak to the service manager. We told him of the problem and he told us the same thing

. Ok, now I am getting upset! I asked him to please just replace the darn seatbelt for us. He said OK. but it will probably do the same thing. I told him that we will just take our chances.
We got our new seatbelt, actually I think we got an entire new seat. LOW AND BEHOLD, the problem is gone!
sorry to get on a soapbox and leading you down a long road to a short ending! But, I would insist on a new seatbelt if the problem persists. It worked for us, it just might work for you. KNOCK ON WOOD, this hasn't happened to the AV yet