The tone generator is internal to the Generic Electronic Module. You can't eliminate the GEM because it controls several functions like power windows, wiper/washer and interior lights.
There is a simple procedure in the owners manual to allow the owner to turn off the Beltminder feature. If you don't have an O/M, there's a link to online manuals in my signature.
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles
2003 XLT 2.3L M5OD-R1 reg cab beater, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid