Join Date: Jul 2010
Location: Des Moines, Iowa, USA
Model: 2009 GL 1800
The avc is auto volume control. When turned to the right it increases the volume for you as you increase speed due to ambient noise.Then when you slow down it will decrease for you too turning volume back down.
Knob 2 (ic volume) is for the intercom, the farther you turn it to the right the louder it should be.I also get a slight background buzz.
The middle knob is the mute. Until you get them working for sure turn it all the way to the left. As you turn it clockwise(to the right) it increases how loud you have to speak before it will over ride the radio and let you speak.
The left knob controls radio volume and has no control of the intercom, and the right knob is for the tone, usually leave mine right in the middle. Hope this helps.
Current ride is a 09 gl1800 level 3
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