W140 Coupe Seat Belt Extender

My seat belt extender stopped working this morning on my 1995 S500 Coupe. The driver side extended then retracted as normal, then my daughter got into the pasenger side, the extender came out, she buckeled in then nothing. The arm stayed extended. I had her open and close the door, unbuckle and rebuckle, but nothing helped. I turned the engine off and on, now the driver side does not work at all. Like a fuse went out. I went into the trunk and pulled fuse #7, it was good. Any ideas? Thanks, Steve