Why does my car stereo make a clicking sound when I charge my iPhone?
I just bought a certified preowned 2009 Mazda Mazda3 hatchback. Whenever I plug my charger into my iPhone while it's connected to the aux input I hear a repeating clicking sound through my speakers. The clicking gets faster and slightly higher in pitch as I push the accelerator. What's going on?
You have what's called a "ground loop". I've seen it on factory and aftermarket systems alike. If it's still under warranty, take it to the dealer. Let them do whatever it takes to fix it. If it's not, you can try re-grounding the headunit's factory ground wire directly to chassis versus in the wiring harness. If your Mazda has a factory upgraded audio system (bose for example), you can try re-grounding the amplifier directly to chassis as well.
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