Ya gotta be kidding me...

Open rear driver door
grab seat right at the shoulder
pull back and look at the big GM connector

this is the termination point of the rear harness
It'* not a "factory cd harness" this is what you get
with base trim. Continues on into the "integration unit"
if memory serves as well as speakers...
when you see a box marked so this is a bus termination

So if I have the changer option the factory harness
changes there....

I promise it'* no fox hunt....

BUT it is just wiring.....
a point of origin INTO the system

There IS factory input.... 3 wire

There is NOT interconnect for it
(no available connector/low level/etc.)

There'* 12v switched in that bundle IF

if you can get the head unit into aux mode without
having classII databus communication

Said from the beginning one might possibly "hack" in
an input - the head be easiest but the wiring terminates
in the rear at that big fat GM connector behind the rear seat!

Ok, I think this is just a misunderstanding of what we have for a visualization of a connector. I found the coupler I think you are refering to but it'* not what we were expecting to find. Our hopes were that there was a dead ended plug sitting there that we would simply plug into this Ipod converter and we would be in business.

Your talking about custom modifying the connector your pointing out correct?

Yes and sorry was not intending to mis-lead 'ya

The cars at the boneyard do not have a changer either 'cuz I was after
the rear harness with a changer. Be nice to have an easy pinout at
the rear termination.

So you have some type of iiPod interface?

Whats it'* wiring all about? does it have 2 "data" lines
if so the hack seems all the more possible.....

Otherwise I was only trying to give a few ideas as to how you could
get input into the factory system....

Dont give up just yet 'tho I sure it can be done just not clear on the how'*!

What about this from PAC - Gm harness is available.....
http://www.cardomain.com/sku/PACAUXPOD

Over at clubgp there is a thread where someone tapped into the PCB on the
radio (talk about the hard way) and was successful.... used the on-star input
right to the circuit board....

I'm going to work on some pictures of this stuff this weekend.

Yes, if you purchase the Ipod interface you also have to purchase the correct cable that will plug into the CD changer data cable and it will allow you to use your HU to control the Ipod but the trick is to find the CD changer data cable.

I'd say then you got this beat....

Determine the harness wiring on the "changer plug" you have

should only be 7 wire?

12v - (-) - r + - l+ - common - data1 - data2

perhaps 8 wire if some kind of trigger is used.

the PAC folks are GREAT ring them up and tell them whats goin' on
- perhaps they have a pinout or a rear harness adapter
for our suituation.

What we need is someone WITH a changer who'* willing to
spend some time describing the wiring and what punches where

I KNOW you got this beat already... you just need to step off
the idea of hav'in a nice clean plug and figure how to wire it up
directly.

I'll look at my wiring diagrams and try to get the changer pinout
and orientation to the main harness.... but we need a kind soul
with a changer to chime in and help at this point....

You are much closer than you think..... YOU CAN DO THIS!

I've wired remote starts and even added power-folding mirrors to a Tahoe so I'm not afraid of do-it-yourself wiring as long as I have clear directions. Thanks for all the help!!

Okay, I removed the plastic back wall of the trunk and found this:



That'* on the drivers side. Coming in from the seat side on the drivers side as Howy suggested I saw only this:



On the passengers side inside the trunk I saw this which I assume is part of the OnStar:



Lastly, coming from behind the seat on the passengers side there'* one more plug that looks like this:



So, all that being said, none of the wiring really seemed to match the pinout in the audio sticky. Given all these pictures can Howy or anyone give me any further direction?

Thanks again for all.[img][/img]

Well your trim level is definately different than mine...

Is that not the power amp (silver box) in photo 3 and
the onstar crud the larger box to the right of the amp

This is the location of my audio amps - guess I have a little
insight after all installing my equipment there! Photo #2 is
the harness terminator I was refering too but it dont look like
mine - your sub harness must do the onstar and you've
either the bose system or the powered audio system.
So there is a change at the plug there from mine.

I've only got a base model car and the sub harness uou've got
as well as the passenger side stuff is not on my ride.

However On-Star interfaces INPUT so there'* a good place to
to fish for the input leads...

The pinout I put up "wraps" at the two grounds so a better
description of it is in the 2k install post but basically the pinout
is only at the HEAD (ribbin) and no further wiring was posted
(as far as rear harness stuff) So what pinout I've offered is
just and only at the HU and nowhere else.... I did however
indicate the proper R-L-Common input lines at the ribbon.

"Rear integration Module" is a bus termination but I donno it'* full
usage It is marked on the audio diagrams as a bus termination point
My luck it'* an air bag tickler that will deploy my bag during some
40hz Bumpin' moment of panic stop! <kiddin'>

I do not have the last connector at all in my car....

So it'* still back to my last post
Find the in'* and the bus leads and wire your "changer control"
accordingly. I'd say it'* perhaps the top connector at the onstar
box- 2 oranges the bus leads and theother couple the output (or in
our case input to the head) and looks like a 12v power or trigger....

Guess it depends on if you still do onstar and if you'r willing
to figure out the pinout manually.... A test light at the head
on the input drops and hit the wires in the trunk till you find them.
(Have to write "you own directions" so it really will be "Custom"
wired! Looks like you've got better chances every time I post!

Go for it!

Thanks Howy, I'm going to study the onstar box a little closer tomorrow and see if I can see any patterns in the wires that match any pinouts I have.

Thanks,