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If I remember right, aren't three things required to make the horn honk?
In Gear, Door open, and seat belt off.
I believe some have jumpered the two wires from the seatbelt under the drviers seat to solve the issue.
No, in gear, door open, foot OFF the brake. If you ride the brake slightly it doesn't honk.
The seat belt doesn't effect the out of park alarm.
I guess we can thank all those people who leave their cars in gear and get out and end up getting run over by their own cars for this.. Then again what's going to stop a runaway cummins?