I have the female stereo Aux jack (switch 5pin) and the necessary shielded wire and heat shrink.
I would actually suggest running two normal (3-pin) jacks. The first will be for the CD changer output, and the second will be for the stereo input. Listening to the CD changer will then be accomplished by connecting the two jacks together with a small aux cable, rather than simply removing the cable, so it's slightly clumsy but here's why I did this: there is no way to properly ground the 5-pin switching jack
. Note how the CD changer has two grounds: chassis ground and signal ground. Here's your choices with grounding a switching jack:
1. "T" into the signal ground cable.
2. Split the signal ground in half, then extend it up to the jack and connect both ends to the ground pin. Functionally it'll be basically the same as a option 1.
3. Connect the switching jack ground to the head unit chassis ground directly.
None of these will work correctly.
With two jacks, you now have this option:
Splice the signal ground just like you do audio L+R; run the CD changer signal ground to the CD changer output jack; run the stereo input signal ground to the stereo input jack.
End result is when you connect the two jacks together to play the CD changer audio it completes a direct connection for the signal ground, AND when you plug a phone or something into the stereo input jack it too gets a direct connection for the signal ground, without the CD changer affecting this line
. That's simply not happening with the 5-pin switching jacks.
I also have a small on/off rocker switch which I think would allow me to splice into the ignition power line going to the CD player on (pin 4) of the CD end of cable. My thought was the CD player is slave to the radio and the radio doesn't know which audio signal is being sent to it after you select the CD player with the mode switch on the radio. What I would like to do is have the ability to turn off the CD player after I have established connection with the Aux input to the radio. This would allow the CD player to not be running continuously while your are feeding the radio Aux audio input signals. Looking at the pinouts for the harness the only control lines I see are the panel light dimmer (pin2) and the PCI bus (pin3). I am assuming that the PCI circuit is the only one that might have logic on it that may let the radio know the CD player is there and ready. All of the steering wheel controls and probably the radio mode controls feed into this circuit. I was just wondering if this is a one way street or once the CD player is selected, does the reference voltage on the CD PCI (pin3) go active high or low keeping the radio informed that it is there?? It would seem to be way too much logic control for this but I do know that if you don"t have at least 1 CD in the player the screen on the radio does not really show a CD connection. Does the radio just sense the amplitude of the audio input signals and that is enough to keep the CD connection?? Once I have a CD in and select the CD player with the radio mode switch and have the Aux audio input signals coming in, I would use the on/off rocker switch to stop the CD player from spinning hoping the radio wouldn't know it. I would like this a lot more than having a blank CD running all the time.
This is an interesting idea. The PCI bus connection is fairly active though, it sends CD/track/time information to the head unit, and it is indeed a two-way street where the head unit pipes in track/CD change requests. Before a CD actually starts playing, the head unit does
start pumping out the audio lines. So, when a CD is still in the process of loading up in the changer, the head unit will already be playing what's coming in on my aux jack. However, if there's no CD in the CD changer the head unit will go straight back to the radio... worth a try though.