It applies to some radios in GM vehicles built during or after 1995.Originally Posted by Dielord
Pin-out of 9-pin AUX connector:
1. Battery Out - Orange
2. E & C Data - Darker Green
3. Ground Out - Black
4. Audio Com In - Light Brown
5. Left In - Orange w/ black stripe
6. Right In - Lighter Green
7. Voice + in - Bare w/ clear tubing
8. Dimming Out - Gray
9. R14 Out - Blue
The 9-pin aux connector is GM aux adaptor. It uses its own proprietary data system (Entertainment and Comfort Control). This connecter is used to connect GM branded CD changers, tape players, OnStar, and possibly AUX adaptors. GM radios are made by Delco, Delco does not release any information about their products until 5 years after first production.
Some radio's have an AUX button, while other radio's have a CD/Play button. These buttons are used to switch between CD (built-in or add-on), CD-changers, tape players (built-in or add-on), and possibly AUX adapters.
You now have two options for adding AUX to your Delco radio:
1) Purchase a 9-pin aftermarket adapter. Link Link Some units are radio challenged, other are not.
2) Acquire (aka junkyard) a tape player then disconnect the right, left and audio com (pins/wires 4 - 6) and connect an appropriate connecter. Remember to insert a tape, to fake play.
At the time I hacked my radio, no AUX existed. So I have the hacked tape player hidden in the glove box. Now that I see AUX adapters are starting to pop-up, I might get one for my other car.
Also I hear Rockford Fosgate makes the cd-changers, you might be able to use their adaptors, but I have not tested this.
Some sites state the AM/FM/CD don't work, but your radio is AM/FM/CD w/ EQ which is higher up. I think it does have CD Changer controls.
www.radiosandmore.com is a good place to search for factory radios. The people their might even be able to provide more detailed support.