It's possible the control module is offline, possibly not powered up if you don't see it on a full system scan. Looking at this scan tool, it does say it will scan the transmission, but isn't specific about any transfer case modules. I'd try the pin 13 trick and see if you get any codes, it can't hurt.
And if you have the transfer case motor with the 10-wire connector, (the 7 wire looks like an older version), you can check for a 5-volt reference coming from the TCCM, that will tell you if it is powered up and alive. This is something we do with engine computers a lot to check if they are powered up, if the 5-volt reference is missing, then something is not fully powered up.
But with either setup you can check the encoder motor for and open circuit. When you get time let us know which connector you have on the encoder motor, then we will know which diagrams to work with. This is the encoder motor that does all the work. If I remember correctly, the motor will move in two different directions to engage or disengage. So, one the two wires for the motor, one will be ground and the other power, and then it will switch to disengage.
I would think if the switch is flashing there would be a code present. The TCCM runs its own diagnostics and can store codes, the PCM is in charge of the engine and transmission.
These are the wiring diagrams for your transfer case setup, I verified the wiring colors with the OEM ones, and they are correct.
Images (Click to make bigger)
Wednesday, November 9th, 2022 AT 8:21 AM