That whine you're getting -- what charger are you using - the built-in USB port in the dash, or a cheapo plug in? I bought a $10 Duracell charger and used it in a Jeep Wrangler (yuck) while on vacation to charge and play music through an aux cord and there was no whine. Same phone with a different cheapo USB charger in the Wife's Acadia and we get the whine. Not enough electrical isolation in the cheaper chargers is my guess.
Maybe run a power inverter with the 120v charger instead?
2006 GMC Sierra 3500 SLT CCLB 4x4
Mods: EGR block, EFI LIVE by Rob (DSP5), Edge Insight CTS2 w/ backup cam and EGT probe, Pacer 07.5+ smoked cab lights, M-A Pump rub fix, TransGo Jr w/ Mike L springs, Russell stainless brake lines. My Build Thread