kronin kronins

Hi guys new here, hoping to get some help for my 09 silverado My 4wd selector switch has no lights., and have done the following Replaced selector switch – did not help, Ground wire under driver door/frame – removed cleaned, did not help Remove the front diff actuator, bench tested it – it works Checked 30A fuse – it is ok Did the reset sequence – keyOn, gear N, turn selector to N wait 30sec – did not help Getting the following codes: B0780 and 90 4wd low range indicator circuit short to battery, same msg for 2H 4L and N. Also getting code U0102 lost communication with the transfer case control module – so I thought the TCCM was bad. I swapped with it with a new transfer case module, did not help, selector switch still dark but got a new code saying something about “Calibration not learned” Even if it is not calibrated, why is the selector switch still dark, so I thought the issue is not the TCCM, Or is it?? I am stuck – any help is much appreciated, thx!