- Dec 5, 2011
After installing two aftermarket head units, each head unit elicited fairly loud dimmer buzz. When I turn the dimmer all the way off, the buzz disappears completely. I have now had two different car stereo installers look at this issue and they both are stupified. They checked all connections and grounds and can't find anything wrong. My set up is Pioneer Avic HU connected through a gmos4 and axxess module to the factory bose amp??? Anyone aware of what causes this condition on our vehicles? I saw some postings about this same issue on the other OS but no solutions. Thanks.