jammedfixed

Hello, The rear seatbelt in my e36 coupe is jammed, i thought it would be buggered so i got another one off ebay for a 10 and that came today. Guess what its also jammed. Any ideas how to unjam it? Also what is the little red button for on the seatbelt reel? Thanks

hi would appreciate any suggestions switched wipers on today clean sweep once, then drivers side jammed mid way across, and the passenger side went loose and flopped against the pillar, ? is it a big job ? an will it be expensive ? many thanks mike :frown