My Dad has a Mazda SUV, a CX-5 (I think) and the front passenger seat belt has locked up. It hasn't been in an accident or anything, and the other belts are fine.
It's out of warranty, but he thinks that the manufacturer (or dealer) is supposed to be responsible for replacing it for 8 years or 80,000 miles - and his car is under both.
Not sure what he's basing that on, I can't find much on Google. Knowing my Dad it may just be something he made up and then decided was true.
He took it to the dealer but of course they want $500-$600 to replace it. I think the part can be purchased for around $65 or less.
Any idea if they actually are responsible for replacing the belt for free, and what the limits are?