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When I first had my aftermarket HU installed (using a Metra harness), the switched power would only work when the car was "on" (engine didn't need to be running, but I had to push the start/stop button).
I've since re-wired it so that the switched power comes on as soon as I insert the key into the slot, but the Metra harness did not work that way out of the box, needed to run a separate switched wire to somewhere under the steering column.
Did you check to see if your Kenwood powers up if you turn the car on?
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