2002 300M Special RBB radio Aux input upgrade - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 3 (permalink) Old 02-22-2016, 11:50 AM Thread Starter
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2002 300M Special RBB radio Aux input upgrade

I have read with great interest the audio Aux input upgrades done on 2nd Gen Mopars and I have purchased an extra harness that runs to the CD (4) player on my 2002 300M Special. I have the female stereo Aux jack (switch 5pin) and the necessary shielded wire and heat shrink. 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. I also plan to tie the audio ground from the AUX jack inline without cutting the audio gnd line in the harness (pin6). I also see that the radio and CD player have B+ battery voltage (pin8) which I believe allows Cd's to be removed or inserted with ignition off only. Should not be an issue in this matter. Any input on this would be appreciated. Remy J
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post #2 of 3 (permalink) Old 03-07-2016, 12:24 PM
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Quote:
Originally Posted by R J STOFFEL View Post
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.

Quote:
Originally Posted by R J STOFFEL View Post
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.
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post #3 of 3 (permalink) Old 03-07-2016, 03:28 PM Thread Starter
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Thanks for the reply and ideas MWISBEST! I just finished installing the 5 pin stereo female TRS 3.5mm Aux jack. I had ordered a CD to Head unit cable but I didn't pay attention to the year the cable fit. Apparently I thought it said would fit all from 98 to 2004 but it had the round plug end for the head unit. I made cable up and had it all ready to go then discovered that in 02 they changed the connector for the head unit end, square plastic grey 8 pin similar to the black square end that goes to the 4cd changer. So I removed the harness from my 300M and cut into it and respliced my aux cable into it. I had done some other research and you are correct that there is too much back and forth on the PCI bus and its too costly to try and stop the CD from running and keeping the HU connected to the CD unit. I ordered the 5 pin stereo jacks (TRS) off a EBAY and they are the same as the ones pictured in the video of the Intrepid Aux project. As far as grounding the Aux jack, all you need is the audio ground (closest solder connector to the input nipple of the jack. You don't have to worry about any other grounds since the jack itself is mounted in the non-cunductive ABS plastic of the face plate. I used a 17/64 bit and carefully reamed the hole so threaded nipple just fit, then used a Dremel tool with a cutting disc and cut a rectangular groove for the jack to set in on the back side and this allowed the threaded nipple to stick out enough to get the retaining nut to attach and tighten. I placed it in the same spot as the you tube video showed. I used a 6 conductor shielded comm cable and soldered the shield to the same shielding around the 3 audio wires of the factory harness and did the rest of the splicing. I did a T connection on the audio gnd connection and split the left/right connections. I hooked up with 1 cd in changer and played CD, great, then pluggged in IPOD in to aux jack and it worked great! If you pause the IPOD there is perfect silence and if you unplug the cable from the IPOD you can faintly hear the CD. Plug IPOD back in and it is silent, play IPOD and music clarity is awesome! I will just live with the fact the CD changer will be running while listening to IPOD, oh well! Thanks again for the reply!
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