2008 Mazda 3. My airbag light came on recently. reset with scan tool and it went out for about a week. when i do a general scan of all systems it says 3 faults on srs system but when i go to that specific module to pull codes nothing is there. if i clear codes light goes out for about a second and comes right back on. sees no value for weight in passenger seat. replaced ocs sensor. same issue. If i try to do learn for sensor it fails. My car has a big square plug under seat with 3 or 4 plugs in it. looks to be from ocs module. i see wire from seatbelt to both position sensors and to airbag in side bolster. Nothing goint to seat cushion. Pulled cushion from frame and it has no wires or air tubes going to it. How does this system work. any help is appreciated. Thanks