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The AWD system uses electronics to detect wheel slippage and to direct power to one or both rear wheels. I would imagine it has to do with that.
 

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Remember, the AWD in these vehicles are not always on. They are 100% automatic and turn on and off as needed, basically a smart system. THerefore they are computer controlled to detect wheel slippage among a few others to determine when to turn the system on.
 
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