Hissing sound

[Civvy]

Hi, I’ve just installed a Pioneer SPH-DA230DAB into a 2012 Honda CR-Z, and when I plug my IPhone 7 in and CarPlay starts there’s a hissing sound. It doesn’t increase with volume or change with engine rpm. It doesn’t decrease if the volume is 0.

I’ve installed a new Apple lead

I’ve tried extra grounds for the unit chassis

I’ve tried my iPad & my wife’s iPhone 6 and they do it too

I’ve tried it with the head unit out of the dash and the lightening cable away from any other wire, no difference.

No other interference

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[LosIsATool 5,000+ posts]

It may just be the S/N ratio on the HU. It doesn’t do it on other sources?

 

[Civvy]

What’s S/N Ratio? It does it when listening to DAB. Maybe it’s charging the phone up interference?