Noise in seat belt tensioner

[teegolf]

2005 Mazda 6, 3.0 V-6, 120,000 miles
Have an annoying springy rattling sound in the drivers seat belt tensioner mechanism. Sounds like a flat coil up retractor spring rattling. Any idea how to fix? Very hard to chase down but that is what I heard while in back seat and car was moving for me to find the noise. Also found the yellow 2 wire connector was unplugged here. Plugged it back in and the air bag light comes on the dash. Any ideas on the sensor or light?

Thanks,
Teegolf

[teegolf]

Sorry posted in wrong model and am not smart enough to delete.