Good morning,
Are there any codes set for the system? You may need a scan tool that can read the 4X4 system. Normal code readers may not pick it up.
If you remove the motor from the transfer case, turn the key on, change commands for two and four wheel and see if the motor turns.
Check all the fuses I attached for power on both sides with the key on.
Roy
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Sunday, March 10th, 2019 AT 5:39 AM