I attached the wiring schematic for the anti-theft system. I cut the pics in half so you could read them better. First, check the TBC fuse. TBC stands for truck body computer (body control module). In addition to checking the fuse, make sure there is power to and from it.
Here is a link you may find helpful:
Also, let me know if anything was done with the passkey. I have a feeling you already tried this, but pic 3 shows the two ways to reprogram the passlock. If you tried it without the scan tool, that may be the way that needs to be performed.
Let me know.
Images (Click to enlarge)
Tuesday, April 27th, 2021 AT 8:17 PM