I may be missing something but I don't think you have to remove the dash on this vehicle. I attached below the process from Alldata. It says the glove box needs to come out and you should be able to reach it.
Also, here is a video on a GM truck that is similar to your vehicle. It is not exact but will give you a better idea of how to do this.
https://youtu.be/tY6M92fA2ug
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Wednesday, December 16th, 2020 AT 7:10 PM