Yes I am, maxwedge. And I was aware when I read the post and went through the trouble to sign up so that I could write my reply. It was purely for myself; I did not expect anyone to see it. In fact, your response shocks me!
The thing is, Karen-type "Let-Me-Mother-You" responses are like 60 grit sandpaper on my inner thighs. So I just
had to say something.
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For anyone reading this now, here's some pro tips for you:
mtstewdog's directions work like a charm - unless you have to "hack" those directions bc your system chimes even when the belt is buckled bc the circuit is for some reason not closing. That was me.
I couldn't find the correct wires under the seat, so I had to open up my buckle and find the little contact that tells the system whether the belt is buckled. You could just close the circuit three times to mimic the belt being buckled—except for two things:
THE DOORS MUST BE CLOSED!
YOUR BUTT MUST BE IN THE SEAT!
See, I tried leaning over my seat with the door open for a damn hour. I could fake the connection just fine, but it wouldn't take. Then I noticed the door chime was going off, so I closed the door latch with a screwdriver to fool the system into thinking the door was closed. Still no dice. Then it dawned on me, the alarm won't go off over an unbuckled belt - unless someone is sitting there.
So I figured out how to make the connection blind, with a screwdriver jammed into the buckle, while sitting in the seat and with the door closed. Trust me, it was a PAIN!
But it worked.
BTW, the buckle casing is held on by a plastic lip at both the bottom
and top of the buckle. Like this:
https://youtu.be/L73Ce5C5_4U?t=41
Except you have to pry the top loose at the red button at the same time.
Then the connection is underneath the little white plastic housing that holds the spring for the red button. This guy butchered his buckle, so don't do it like this—but he does reveal what the connection looks like so you know what you're looking for:
https://youtu.be/CNLu_0tRFa4?t=122
I hope this helps someone.
Happy DIYing.