I tried to find where exactly I read it to confirm I am not speaking out of my a$$, but can't..... been some time ago. Kindly correct me where I've gone wrong.
From memory, if you push & release the Advance Trac or traction contol button, traction control is disengaged until you reach 25 MPH. Simple enough.
NOW... if you press and HOLD the same button for about 5-6 seconds, the dash light will blink several times & return steady and now auto 4X4 is disabled, again, until you reach the same 25 MPH. Holding the button disables, for lack of specific knowledge "the other systems" that are used to engage our 4X4 automatically. (wheel spin detect, brake assist, etc)