Help!! 2002 w/on star, can't get aftermarket head unit to work!

[rickn6]

My problem is I have no sound coming through my speakers!  I have installed many head units on many different vehicles, but I just can't get this one to work.  I wired everything correctly I have checked it over many times, as did a buddy of mine.  I did notice that when I plugged in the stock deck it also had no sound coming out of speakers untill I hooked up the smaller second harness which i thought was just for onstar.  I have a sub wired dirrectly through the new deck and that thing is putting out sound, just not my speakers.  It must have something to do with this second smaller plug in???  Any input?

[ygmn]

second plug is for onstar and other computer communication issues... along with AUX inpu to old radio...

[ShapeShifter]

How exactly do you have it wired up? Are you using the stock speakers and the stock speaker wiring? If so, are you still using the stock amplifier, or do you have it bypassed?

My guess is that you connected the new unit to the speaker wires at the connectors to the stock radio, and are still going through the factory amplifier. If so, you are probably missing the signal to turn on the amplifier. My suggestion is to do the factory amplifier bypass, and it will probably start working. Even if the amplifier trigger is not the issue, most people who have done the bypass (including myself) think the system sounds much better without it. (There are several topics on the subject, one of them is HERE)

I have a complete set of wiring diagrams and connector pinouts for the 2002 entertainment wiring, but they are too big to attach (330k.) I can email them if you wish so you can cross check that with what you've done and maybe you can find something you missed?

Good luck!

-- SS