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Q:

Seems like AWD is always engaged on 2003 Oldsmobile Bravada

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ON righr or left tuurns, diagonal wheels seem to catch. One set one way, opposit when turned the other way.
(1) Answer
In a true AWD vehicle, the system is operational all the time. I suspect you have a problem in the transfer case that directs power to the front and rear differentials. In AWD, the front and rear differentials must be able to turn at different speeds in turns, if the transfer case is not allowing this to occur due to malfunction, you'll get the symptom you describe. Get it to a GM specialist or a 4WD shop for a proper diagnosis.
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