I just finished installing the "seat occupancy mat emulator" that you recommended to me; it was a bit difficult to squeeze myself into a position where I could see what I was doing (septuagenarian, 220+lbs, bad back, bad knees...the usual excuses), but it's done.

I started up the Foxwell NT510 E to clear the seat/airbag code, and there was no buzzer or alarm, so I didn't need the jumper, nor the false seatbelt plug I have. The light is now gone from the dash.

But, after your comment above, I wondered if I was missing a "dashboard buzzer", so I re-inserted the key, jiggled it a bit, and the buzzer sounded-off (door was open). I wonder if it has been active all along, and just needed a jiggle to set off, or has it been buzzing all along. I very rarely open the door without the key in my hand, and if I'm working on the truck, then it doesn't matter.

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide