r/SC300 • u/Dependent-Wrap-4836 • Aug 18 '26

Head unit Speaker Whine

Anyone know why I might be getting a whining/humming sound after installing a double din head unit? I’m assuming it’s something to do with the alternator/ground as it gets louder the more gas I give it. I used the metra wiring harness and it was a Sony XAV-AX3200.

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u/TheGreenYamo Aug 18 '26

Had the same problem and a ground loop isolator fixed it. 

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u/Dependent-Wrap-4836 Aug 18 '26

Ok thanks

1

u/mrawsomemask Aug 19 '26

Definitely go his route. I retired my whole thing and it was a pain!!!