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No power

my daughter in law has a toyota scion.The remote door lock will not work.With key in ingnition no power no lights nothing .Had th e battery replaced one month ago.I am clueless

Start with the simple things. Check the cables to the battery. Maybe one of them is loose or disconnected. Also check the ground connection.

Then look in the under-hood fuse box for a blown fuse or circuit breaker.