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There is no programming nor steps to do that. The only way to disable this chime warning is to physically damage the chime which would result in none of them working.
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Your wanting to cut the key in switch wire. That should trick the truck into thinking the key is never in the ignition, which should of caused other issues with other systems. However if you want to try it, I can not stop you. On this model its the blue/gray wire at the ignition switch and goes to the BCM.