That isn't entirely correct, industrialfish. I have an 07 and have been dealing with wiring a new deck up without the harness and at first couldn't find a switched power source. But I poked around with my multimeter and found a wire in the fuse box on the passenger dash that only had power when the car was on and stayed on when the car turned off until the door opened (like a stock deck). I beleive it was a thicker yellow one, but a multimeter will find out anyways. I used that for my switched for the new deck.
But for my car I needed to keep the stock monsoon deck as well or my theft system freaked out and my newer deck is all wired separate from the battery and etc now. Kept the stock one wired under the dash
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