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I'd like to raise some caution about the 3 second thing. I had the same sequence when I originally installed my head unit. What I found is that once in a while, usually once a week, it would last longer then 3 seconds. When it lasted longer it generally didn't turn off until the battery was dead. At first we avoided a dead battery by pulling the fuse. The fuse how, ever is not intended to be a switch and can wear out. If it does wear out, what a bear that can be. In the end we needed the resistor to make for a consistent turn off, as well as a permanent fix.
Good luck.
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