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Alright, here is the how-to! Let me first start with a thanks to LS1Tech.com for the basic synopsis of how to do this. This how-to will go over placement of an AUX port on the faceplate, along with more pictures and instructions on how to setup a computer power supply to power your stereo.

Doing this takes basic electrical knowledge and soldering skills. Do not attempt if you are not comfortable with electrical projects. I am not responsible for any problems that might arise while doing this.

First, let’s go over how to connect your stereo to a computer power supply so you can bench test everything as you are working.

Tool Required:

Late 90’s GM Stereo Wiring harness
Two Vehicle Speakers
Wire Nuts
Wire Stripping tool
Solder and soldering iron
Heat shrink tubing
Miscellaneous screwdrivers and small sockets
Dremel Tool
Cat5 Cabling to get wires from
RadioShack 274-0246 Switched 1/8” Audio Port
Computer power supply (20 or 24 Pin ATX)
Paperclip

A.) Cut Molex Connector end off and wire the follow cables highlighted in yellow to the yellow cable on the Power Supply. Then wire the black ground to the black ground on the power supply.



Here are the vehicle harness color codes:
Constant 12V+ Orange
Switched 12V+ Yellow

Ground Black
Illumination Gray
Dimmer Brown

Antenna Trigger Pink
Antenna Right Front
Front Speakers
Left Front (+) Tan
Left Front (-) Gray
Right Front (+) Light Green
Right Front (-) Dark Green
Rear Speakers
Left Rear (+) Brown
Left Rear (-) Yellow
Right Rear (+) Dark Blue
Right Rear (-) Light Blue

B.) Wire up speakers on a Left and Right Channel.

C.) Short out the black and green wires on the 20/24 pin ATX power connector with a paper clip to allow the power supply to power on.



D.) The radio should now live outside of your vehicle one you flip the switch on the power supply/plug power supply in.



Alright, once you have the radio setup for bench testing, unplug the harness from the back of the radio and let’s get going.

A.) First, remove the screws holding on the bottom cover. There are 3 total.



B.) Now you should decide if you want to run a cable elsewhere with your AUX port or have it on your faceplate. I elected to put it on my faceplate, but this is quite a bit harder to do. I will be going over installing it in the faceplate however, since that is what I did.

You should now see our CD Data Cable. The first and third wires are all we care about.



C.) Now to remove the faceplate there are 8 tabs around the corners of the faceplate. Pry each one out and gently pull. Unplug the connectors on the board that go to the faceplate and gently pull the faceplate out completely.



D.) Remove the small screws holding the backlighting board onto the plastic faceplate. This would be a good time to replace the bulbs or install LEDs.



E.) You must drill a hole into the insulation material so that you can run the cabling though to the main board.



Then, you must take out some of the support material behind the plastic faceplate to fit the port inside, along with drilling a hole and cutting the metal plate behind the knobs slightly. You will want to move your hole over a few millimeters, as mine was very close to the dash bezel.



F.) Now, Dremel the backlighting board slightly using a cut off wheel so that it is slightly thinner so it will allow the AUX port to fit in-between the backlighting board and the faceplate. Don't worry. There is no wiring there.



G.) Next comes the soldering. This is not an absolute requirement, but is preferred. You need five wires. Two for each channel and then a ground. Make sure to run your cables first.


(Excuse my crappy mspaint drawing...)


Radioshack Wiring Diagram

Pin 1 - Ground - connect to the stereo chassis
Pin 2 - Left Channel - wire from CD connector on main circuit board
Pin 3 - Left Channel - wire coming from CD player module
Pin 4 - Right Channel - wire coming from CD player module
Pin 5 - Right Channel - wire from CD connector on main circuit board






H.) Now, install everything in reverse including the AUX port to put the face plate back together. Connect cabling and test it out.



If everything works, the end product should work similarly to this:


And should look like this: (I was in process of replacing bulbs in that picture, so excuse the bottom backlighting.)



And this when installed: (As you can probably tell, you may want to move your port over towards the bottom knob from mine.)





Enjoy! Comments are welcome.
 

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Nice how-to !

I thought about doing this mod a while back to the older unit with the cassette player however i just decided to go with an aftermarket deck.
 

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Discussion Starter #6
Thanks everyone! I hope that some members get some good use out of this.
 

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Discussion Starter #8

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Electrical Mod
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I'm going to add it to the sticky. I was on my phone earlier. I like it overall, but I'm not personally a fan of the needing a CD in to use it. It's a great write up regardless though.
 

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Discussion Starter #10
Woah, thanks!

I know that doing this to a cassette player is very similar, and there are other options including connecting it direct to the radio left/right channel, but that involves probing the board with a set of powered speakers and I'm honestly not steady handed enough for that kind of stuff. I understood and knew it would be very hard to short something out doing it this way.
 

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Tech Mod
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30,700 Posts
i did the tape player methood since mine came with one.

very nice writeup but how does the cd player stop once you plug in the aux? that is what i dont understand. with the tape player method you have to hit AUX button to play the tape player to get the aux input to receive.
 

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Discussion Starter #12
It doesn't stop. The CD keeps playing but the left and right channel are now switched over the 1/8" audio jack in only. Once you unplug it, it switches back.

The Radioshack 274-0246 is a switched 1/8" jack.
 

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Tech Mod
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DUH! LOL thats why :doh:

for some reason i didnt see that when i glanced at the schematic. didnt know they made those.
 

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Discussion Starter #16
I'm going to pic up a few more and do it to my sisters Escort to and keep a few around. They're pretty cool.
 
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