Your Jetta has two power feeds, one is always live and one is switched.
Unfortunately the color of the wire sometimes varies by model or year so I can't tell you which one.
I assume you're using an aftermarket harness that you've spliced to the kenwood harness. If it came with documentation (the harness), it should tell you which feed is always live and which is switched. if not you can test the leads with a volt meter when the car is on and when it's off.
You most likely have your power line on the Kenwood deck hooked to the line that's always live. Find the switched line, and connect that one instead. Should work.
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