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do you know if you can communicate with the 4WD module to pull codes ?
are there any 4WD codes set ?
if no codes the issue is going to be a bad encoder motor on the transfer case or a bad module
if the fuses are all good and no codes and you can communicate with the 4WD module then remove the encoder motor and if you can shift the case by hand into 4 HI and then back to 2WD then the encoder motor is bad
if no communication with the module then the module is bad OR needs to be reprogrammed with updated calibrations to correct this issue of the module not powering up
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iif it gives you codes or says no codes then it communicated
if the code reader or scan tool used says can not communicate or comes up saying it can not read the codes from the 4WD module then the module is not communicating