Quote:
Originally Posted by Freon
I have a sort of noise (not sure its a "buzz") as well when the car is actually off. Very strange behavior. It also sounds like there is some emissions/charcoal cansister pump stuff going on under the trunk after I park and lock my car sometimes, so I suspect that is creating some noise in the electrical system that makes its way into the speakers. Still odd that it happens when the car is off and the radio is presumably unpowered.
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Some of the early '08 & '09 cars got a buzzing thru the speakers when the car is off. That was fixed via a SW update.
The hum or buzz noise under hood, is sometimes referred to as the "fax machine" or "laser printer" warming up noise. Thats normal. I think its the electric water pump cycling coolant thru the system. IF the noise is coming from the rear of the car its the low pressure fuel pump(LPFP) - preventing vapor lock.