[GTvert]

Alright, I thought it was a joke, and someone had a camera on me when I was doing it, but,hey it worked.

Make Sure:
*The parking brake is set
*The truck/car is in Park(Automatic),Neutral(Manual)
*The ignition is off
*All doors are closed
*The driver's safety belt is un-buckled
*The Parking and Headlights are off

Then follow these steps:
1.Turn the ignition switch to ON,but do not start
2.Wait for the safety belt warning light to go off(1-2 mins)

Steps 3-5 have to be completed in 60 Seconds

3.Buckle,then un-buckle the driver's safety belt 3 times
4.Turn the headlights on, then back off
5.Buckle then un-buckle the safety belt 3 more times

After step 5,the Safety Belt Warning Light will be turned on for 3 seconds.

6.Within 7 seconds of the safety belt warning light turning off,buckle then un-buckle the safety belt.

This will disable the belt minder if enabled,or if disabled,will re-enable.

7.Confirmation of disabling is provided by flashing the safety belt light 4 times per second for 3 seconds.

That's it, takes about 5 mins.Well worth to get rid of that annoying sound.