I noticed in your other pic from the aux switch forum, next to your parking sensor button, I have one for traction control, that would be my guess, some trucks have both next to the 4x4 switch
My '06 has the two blanks, so different dash but probably same thing. One's for the adjustable height pedals and the other is the manual airbag override.
I'm sure most trucks have a close to universal wiring harness and then they just put them in dummy blanks if it's not an option for that specific truck.
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