12volts to both of the 12volt + lines (one will sense ign and the other it will draw power from) and a ground.

Hook up a spare speaker or two to the HU and you can bench test to you hearts desire

Do you, or someone have the pinout listing for the port?

Thanks.

I know the colors are all over the forum, and I am sure someone has a picture of the connector.

Found this: http://www.installdr.com/Harnesses/GM-Wiring.pdf

Looks pretty good.

Several steps closer today!

My question is, how are you going to put an Aux in on a stock radio that doesnt have an Aux setting to listen to the Ipod? How will you switch from Radio/CD/Ipod and back again?

I dont know if its actually possible. :?:

hes going to have to lose a function, either cd or tape?

I'm (as I write this reply) designing the interface circuit I'm going to build this week to interface with the mainboard and the CD player unit

It will have electronic remote controls to select the source, I'm also designing in right now.

And as with everything I do, no one will be able to tell it wasn't like that from the factory. I HATE aftermarket headunits

Oh no, I don't do losing functions

EDIT: Of COURSE as soon as I start to make tangible progress there will be many pics and documenation.

OK! Great news, and better news!

So I spend a couple hours in my lab today working on the tape playing spare stereo I acquired last week. Got it all taken apart, first step was to get it power, make sure it worked properly:

Bench setup: Function generator, full DC power supply and integrated speaker for my testing needs; digital oscillioscope; and a couple comps :P


YAY the stereo worked the first try!



This is the wiring required to get it on, and get an audio output from it, just one channel though:



So once I had audio playing off a tape and through the amps and to my test speaker I started probing the interface bus with the scope to find the line signals, this was rediculously simple, I found them first try:




So now that I've found those line level interface lines, I needed to figure out what their correpsonding ground lines were, again first guess I found the right ones.

So now came hooking up my pod to see if I can play some music through the stereo!!!




All the wires I had to cut:


Pod amped output, hooked up to the stereo'* new aux input:



The tape I had to go and buy for $0.99 cause I don't have any!!!



SO! In conclusion of this post, the MOST important part has been accomplished it IS possible to do this and sounds pretty damn good.

I'm currently waiting on some circuit parts and some special wiring before I can permanently integrate an aux in!

I'm going to be going home to see my car on thanksgiving, so expect to see a FINISHED WORKING aux input on a stock Bonneville headunit around that time! (For you Americans that'* in 2 weeks from now)

-brad

Very impressive.

Now what would be cool is if you could find a spot to mount a 1/8" plug onto the front of the stock HU so that you could plug any aux directly into the HU on the front.

How does the HU determine the different sources? What was your "ipod" labeled as, what did the HU think it was?