Your Santa Fe has electronically controlled (part-time) 4WD. If the front
wheels start to slip, it'll engage 4WD automatically. In slippery
conditions, you can use the "lock" button to keep 4WD always engaged at
low speeds. As your speed increases, the 4WD control module will
gradually reduce the amount of power to the rear wheels. Your owner's
manual will explain this in more detail, including specifics on speed
which I don't remember off the top of my head.
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