The module has a G-force sensor that will cause the belts to lock up immediately, before your body starts to move forward.
I just put 12V to the rachet mechanism, it's the wire that comes down from the seat back. That releases the belt rachet. On my seats, both belts lock up with a fast sudden pull, like when your body moves forward.
I didn't know about the sensor when I got my seats, the wiring on both were just cut at floor level.
If you can get the module and mount it that will work.
I'm OK with the way my belts lock up with motion.
