1993 E250 5.8L

Can someone help me locate my airbag module?

I had error 12 and 51. I found a disconnected plug under the driver seat (occupency mat). I repluged it, and the error 51 is gone, but I still have the error 12. My batterie and alternator are 100% functionnal.

I checked all my fuses (in cabin and under hood) and they are all good.

I would like to probe the module to see if there is voltage on pin 13 but I don't know where it is located.
I saw a light blue-greenish plastic box under the dash, driver side, inline with the headlamp switch that has two connectors, is it this one?

Is there a reset possible on the airbag system?
I was reading on a Mustang forum that those cars (same era) had a 2 pin connector behind the glove box, that you had to jump a wire between the terminals to reset the airbag module.
Does our vans have the same, if yes, again, where is it located.

Thank you.