Rewire CD to Bluetooth module/adapter

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dnudelman
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Hi,
One of our members used to make aux adapter for the Bose stereo with CD changer in the trunk. He's given up that business. Does anyone have current info on how to adapt a bluetooth module to the CD input?
Thanks
David
94 Q45


EdBwoy
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I have no idea on how to do that, but are you open to using one of those FM transmitter style units? They must have greatly improved over the years as I have seen a lot if positive reviews for the Griffin iTrip transmitter recently.

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Q451990
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Post up a link for the Bluetooth adaptor you're considering. I may have some ideas...

dnudelman
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dnudelman
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EdBwoy wrote:
Tue May 29, 2018 12:22 pm
I have no idea on how to do that, but are you open to using one of those FM transmitter style units? They must have greatly improved over the years as I have seen a lot if positive reviews for the Griffin iTrip transmitter recently.
Yeah, I've tried several. No clear FM channel in my area, still get lots of white noise at 87.7

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Q451990
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After reading your post yesterday, I stumbled across this adapter. The one thing I like about it is that it has a amplifier turn-on output that's live when the BT receiver is in use, which if it outputs 12V, would be perfect for switching the aux input. https://www.amazon.com/Audiopipe-Blueto ... +audiopipe

I'll have to look at the FSM for the 94 to see if it's the same as the earlier Q. On my car the head unit uses a DIN style plug, so it's a matter of making an adapter out of some RCA female cables, and feeding the correct pin 12V to switch the head unit over to the aux input. Are you handy with a soldering iron, or would you need to have the adapter made?

dnudelman
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Handy? I've done a few Heathkits in my younger years. Used to have a Radio Shack free battery card. LOL

dnudelman
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That Audio pipe unit looks like just the ticket

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Q451990
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Wow... I had completely forgotten about the free battery cards! I learned that nine volts don't last long if you plug them together courtesy of that card.

dnudelman
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According to this site
http://carstereohelp.net/wireharness_Infiniti1.htm

Din 4,5,6,7 are the inputs pretty straight forward.
I'm not sure what pin 1 (aux on signal input) and pin 2 (combi on signal output) do.
Any ideas?

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Q451990
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I believe pin 1 is the 12V input that switches the head unit over to the auxiliary input. Pin 2 isn't used. I have the AudioPipe part on the way, so we'll see how it works.

dnudelman
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reading other threads, pin 1 for momentary 12v attached to a switch. I wonder if Pin2 has 12v that could power the audiopipe unit. I just received the audiopipe yesterday. I've got the din plug and the female rca cord. Blue/white on audio pipe is to turn on external amp. I wonder if it would be used for pin 1 to switch the head unit.

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Q451990
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I don't remember checking pin 2 to see if it would provide 12V to something else. I always just pulled 12V elsewhere.

The 12V to switch the head unit over can be continuous or a momentary pulse. In all of my installations of CD changers, and an ancient NEO MP3 jukebox (that is going to hopefully be replaced by the audio pipe adapter) I've fed it with 12V any time the external source is on. The only catch is that you can't just press the tuner button to switch back to the radio, because the external input will override it... so you have to turn your external 12V input off before switching over.

dnudelman
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I wonder if it would make more sense to use the amp on blue/white from audiopipe to feed pin 1. Audio pipe power would have to be switched on and off so either way you would need a switch. If pin 2 is power that is switched by the CD button, that would work. Do you concur?
thanks
David

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Q451990
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I just got in from installing mine. On the earlier Q, the input is a 5 pin. So Audio L+, L-, R+, R-, and 12V trigger. I used the adapter I made for my other one, and just hooked the blue wire on the AudioPipe adapter to it. It outputs about 12VDC whenever the adapter is outputting audio. So in my case, opening my phone screen (which makes a little bit of a noise) triggers the radio to switch over if the Bluetooth connection is active... even if I'm not playing music at the time. I can avoid this behavior by turning Bluetooth off in my phone's menu, but it'll take a bit of getting used to. Sound quality seems good... I noticed a tiny bit of engine noise that I'll try to get out with a filter when I can find it, but nothing too obnoxious.

I wired the AudioPipe to the cigarette lighter wiring (same as my old NEO MP3 player) so it's receiving power any time the car is on, with the ground wire to a screw on the chassis. On the older Q there is no CD button on the head unit... only one for the tuner, and one for the tape deck. The deck just switches over to the auxiliary input when the correct pin sees 12V, and allows the other switches to work (tuner or tape) if there's no 12V on that pin. I'm not sure how your 94 setup works.

dnudelman
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Thanks, will work on it tomorrow.

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Q451990
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After thinking about it, I think this is how the earlier Q is wired.

Image
Image

From looking at some head units for sale on eBay, I suspect yours has two DIN connections, a six pin for a telephone, and an eight pin (like you linked to) for the CD changer.

HollywoodJackson
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There looks like a lot of plugs in back of the cassette player for the '02.

Image

Can any of these plugs be used to install the BlueTooth receiver? (that's not my hand, by the way LMAO)

All the best,
~HollywoodJackson~

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Q451990
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If you have the factory service manual, there's a nice wiring diagram on AV-13 that shows the audio inputs. What I don't know is how one would switch the system to those inputs. If you have a working changer, you might try probing pins 8, 9, and 10 to find out what they're doing. I'm guessing these are the communication lines between the changer and audio unit (a/k/a tape deck) and probably use some sort of pulsing LAN type signal. By 2002 switching something with 12V or Ground was out of style for the most part.

HollywoodJackson
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Will the Bluetooth HC-05 (by Velleman) Transmission Module work? I see it's a 6 pin chip.

Pins are as follows:
  • STATE
  • RX
  • TX
  • GND
  • VCC
  • EN
I'm hoping I can install this INSIDE my cassette player, using a power line (to the tape deck motor maybe) , a ground to the cassette player frame... And here is where I get lost.

Since the HC-05 only has one pin going out (transmit), how should I hook it up to what I suspect will be TWO lines coming from the heads that actually get the signal from the cassette...

All the best,
~HollywoodJackson~

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Q451990
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That's way beyond my electronics skills... At first glance I'd say this is a bluetooth transmitter that you'd integrate with a source to convert audio to bluetooth, but that's just a guess. Here's a link to it in case anyone else comes along and has some thoughts. https://www.velleman.eu/products/view/?id=435518

cbird805
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I believe this is what youre looking for is the 8 pin DIN connector mod. The link o the thread : 94-q45-aux-input-for-mp3-t194403.html

I took a 3 ft 8 pin DIN cable, cut it in half and wired it to RCA outputs. You also need to wire the AUX IN signal (Pin 1) to a momentary on push switch to chassis ground. I have the instructions saved as MS Word .docx file but can't figure out how to post it with the graphics.

This only works for 93-94 HU, the late 94-96 HU had the 8 pin DIN disabled-BUT, they may work with the GROM aux input (cd changer version). I hope this helps.

cbird805
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I believe this is what youre looking for is the 8 pin DIN connector mod. The link o the thread : 94-q45-aux-input-for-mp3-t194403.html

I took a 3 ft 8 pin DIN cable, cut it in half and wired it to RCA outputs. You also need to wire the AUX IN signal (Pin 1) to a momentary on push switch to chassis ground. I have the instructions saved as MS Word .docx file but can't figure out how to post it with the graphics.

This only works for 93-94 HU, the late 94-96 HU had the 8 pin DIN disabled-BUT, they may work with the GROM aux input (cd changer version). I hope this helps.


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