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I have a 2013 Range Rover Autobiography and the sound system has gone silent except for static noise that starts when I open a door and with no ignition on. It continues with no radio switched on and sometimes gets louder. Any ideas please
 

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Make sure that the amplifier shuts down when the head unit is off. If it does not, electrical impulses will be picked up by the wiring, and, surprise surprise, gets amplified by the amp. This issue could be the result of a head unit issue or a sticking relay. It may drain the battery if the BCM does not "see" it. Ray
 
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