SUPPOSEDLY any Nissan dealership, but I've heard stories of some refusing the service, some doing it....it isn't in their interest to refuse because Nissan is paying for the service, and they get the same amount they would if the consumer were paying for that service, so honestly it shouldn't make a difference to the dealer....I highly doubt they'd convert to a manual seatbelt

More likely than not they'd just give you a new auto system, IF yours is somehow not functioning correctly...my driver side isn't working very well, I have to push it all the way back for it to work, I'm gonna test out the warranty myself, most likely when I get back to school.