Hey, I just installed a deck for a friend of mine, it has an attenuator lead.

It's supposed to work in conjunction with a cellphone? How does one go about using this lead? Thanks a bunch!

Pioneer DEH-7500 MP in case anyone's wondering.

 

Does the wiring diagram say anything other than mute/attenuator lead?

 

I checked the wiring diagram and it didn't provide much for information.

 

I don't know what to tell ya then, you could try looking in the owners manual for some info on it.