Question for those using GM9-AUX - Chevy Impala SS Forum
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post #1 of 3 (permalink) Old 12-20-2006, 11:05 PM
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For anyone that is using the GM9-AUX to play MP3 or any kind of audio into the CD changer port of the factory head unit.

What is your factory head unit doing while your playing the aux input? Does the head unit display show that
- a CD is playing?
- a CD is paused?
- AUX mode is selected but CD changer not playing or paused?

If the first or second choice, CD playing, does a cd actually have to be loaded and spin as if playing while using your AUX input?

I have a Theftlock AM/FM/Tape head unit. I have a stock GM 6 disc changer with the cable. I tested and both work fine. I want to try and identify what each pin position of the cable is doing at a given time and if left and right audio imput such as from MP3 player can be acheived with the headunit in AUX mode without the CD player actually playing a CD.

I'm assuming the GM9-AUX is a circuit that tricks the head unit into thinking a CD is playing so it accepts the left and right channel audio input from what ever is plugged into the RCA connetors of the GM9-AUX. I don't have one of these GM9-AUX units to take apart and am wanting to find out if the circuit is simple enough to recreate so I don't have to buy one that I can't afford.

If I can get the answers to the question above about what the head unit is displaying while your aux input is playing that will give me info I need to play with my theory.

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post #2 of 3 (permalink) Old 12-20-2006, 11:31 PM
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Mine display CD, and display time, with nothing till the sound input start. Then track 1 CD 1 display and the time goes on and on forever till I shut the car off, or switch back to radio. I doesnt have any form of cd changer. my headunit is a tape/aux from a cavalier 97.

There is a chip in the aux9 module that emulate the cd changer somehow..
post #3 of 3 (permalink) Old 12-21-2006, 04:53 AM
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Thank you, that was the info I needed.

Something I forgot to ask was if anyone has the GM9-AUX and can still use there CD changer or not?

I've read were some say you can no longer use the changer with the GM9-AUX hooked up and others say you can. Tried searching on the web and came across one comment that the pre 2000 theftlock headunits won't recognize two inputs, but the after 2000 models will recognize both the GM9-AUX and the CD changer.
Since my computer is to old to run I-tunes, it will be rare ocasions that I can change the music on the used Ipod given to me, so I'd like to still be able to use the CD changer. I'm still thinking the best route is to see if I can piggy back the MP3 audio input onto the CD changer cable.

Well, I've got enough info to break out the multi meter and see what I can figure out.

Anyone know were best price is on the extension cable to mount the CD changer in the trunk? I've got the cable that reaches from stereo to console storage slot, but I don't know if it will reach from B-body stereo location to console and I really don't want to loose my under armrest storage anyway. There was a guy on ebay selling them, but I couldn't find any on ebay search.

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