Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
Mentioned: 3 Post(s)
Quoted: 32 Post(s)
I believe it depends if you have an AGW or not, the mute wire at the HU should work fine on an Audio 20 CD but an Audio 20CC would not have any. Others may have a wire that is not connected to the AGW mute wire where it should if the car has one.
The mute signal is an open collector type, you can connect to it even if other devices in the car were already connected.