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My 2016 Energi SE just started having the following problem; When the ignition is on (but not the radio) I hear an intermittent loud static noise coming from only the driver's side rear deck speaker. Of course when I unplug that speaker, the noise goes away. With the help of YouTube I was able to locate the amplifier for the rear deck speakers, which is in the right side of the trunk behind a black trunk liner. There is a connector on the rear of the amplifier that goes to the speakers (I confirmed that by the wire colors). On the front side of the amplifier is another connector. Using a multi-meter I was able to determine 1 wire is 12V and another is GND. There are 3 signal wires that have about 100 Ohms on them with the ignition off and about 5V on them when the ignition is on. The 12V is active with or without the ignition on!!! Yes, this amplifier is on all the time. Seems crazy on a plug in car. This can also be confirmed by listening to the speakers; there is a very slight hissing sound all the time; unplug the 12V from the amplifier and it goes away. This looks like it could be a debugging nightmare. My next step is to unplug the 12V when the noise reappears. I know the noise will stop but that doesn't guarantee the amplifier is bad. The only reason I can think of for this amplifier to be on all the time is if the rear speakers are used for some audible alert(s) or alarm(s). I have no idea how to determine that. I called the dealer and they said to bring it in and the'll debug it. Those guys are mostly black box replacers and they could replace a lot of boxes at my expense, so I want to narrow down the problem for them further before bringing it in. Any help with this is greatly appreciated.