Join Date: Nov 2007
Location: Santa Rosa, CA
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When the computer detects slipping in the front, or lack of traction, it kicks in the 4wd system or VSC, depending on what it knows.
If you're going around a corner and may be slipping, the computer will turn it on.
If you're stuck, pressing the "lock" button should turn on 4wd until you hit 25mph. Then it turns off and the computer will turn 4wd on if necessary (slippage condition).