Anyone with Navi has SNHOND3 and HON03-F/MM Y-Harness setup ?

I have this setup. When I switch on lights, I get continuous buzzing sound on the driver side speakers/tweeter.

 

Hmm...Sounds like back in the day when I didn't have something grounded properly on my old Mazda Navajo. Turned out that that the one bolt that should have been able to be a ground was touching something else underneath, creating a loop to the speakers on the right side of my car.

I'd check out the ground on that unit first. I hope that helps!

 

Same set up - no buzzing. I have a ground loop isolator installed though.