I recently got a new iphone cord as it was giving my headunit which is an alpine a current error reading and I couldn't charge my phone half of the time so I knew I had to get another one and hey maybe it would help sound quality but nope well maybe but at least not this issue. I usually keep my volume on medium (if this matters?). I have an Iphone 5 and use spotify mostly. Since my noises are coming from under the hood and don't bother me while operating the car I'm not gonna do anything unless there's some kind of recall or TSB.Click to expand.Hey Drowned it's still going on, haven't been on lately. And to have it coming from more than one component suggests to me that GM contracted with a manufacturer to supply certain parts to meet certain criteria, but either that criteria didn't include audible noises or they chose not to worry about what they've discovered. I've never heard any other car do this, ever. I would hazard a guess that your amp is having the same issue. It makes me think it is something like a power transistor or IC that is being cycled somewhere around 12-20,000 times a second, and the power running through it is such that the switching/cycling is audible. There's an electronics package between the battery and the radiator support that the noise comes from. It's not audible inside, but can be heard with the hood up or down.
My '09 and this '11 both have a similar noise from under the hood when the key is in ACC or RUN. It would seem that the amp itself is generating the noise, either through the speakers or from one or more components it is built from. Like SS has asked before, and which you have answered, no matter the volume when the radio or BT are in use, and no matter any other load, the sound is a constant dB level and pitch. All of those require the amp to be powered for the sound to be generated. Click to expand.With that info it's clear to me that the sound is generated only when the amplifier has to be used, i.e.: radio, phone, signals.
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