Technical Aux in mk2b

jmckee4 · Dec 14, 2012

Hey guys, I've already posted in I.C.E but no replies. I think the mk2/2b forum has more views

Anyways here is the post. https://www.fiatforum.com/i-c-e/313917-punto-mk2b-aux.html

Wondered if it was possible to connect out certain pins to simulate cdc connections? I don't know a lot about it so I could be way off

Found this if it will help anyone: http://www.team-bhp.com/forum/attac...592-ipod-punto-emotion-stereo-pinout-diag.png

Thanks in advance

s and b · Dec 14, 2012

cant see an easy fix
junk the fiat player on the bay
buy an updated usb player,its much easier and no cumbersome jittery cds to contend with on our pocked roads

jmckee4 · Dec 14, 2012

Thanks, thought that might be the case, which is a shame as I really don't like aftermarket HUs.

s and b · Dec 14, 2012

jmckee4 said:
Thanks, thought that might be the case, which is a shame as I really don't like aftermarket HUs.

i know what you mean
most of them sound junk under real load

jmckee4 · Dec 14, 2012

Not just that, I think they look awful, even with the surround they look out of place.:yuck: Maybe a bespoke fascia which is a similar fit would look ok but obviously they don't make such a thing.

I've read a post from someone trying the same thing and apparently holding the SRC button when switching on the HU activated the changer setting so I might have a go at that. Annoying but I could live with it if it works

jmckee4 · Dec 14, 2012

jmckee4 said:
I've read a post from someone trying the same thing and apparently holding the SRC button when switching on the HU activated the changer setting so I might have a go at that. Annoying but I could live with it if it works

It Works!

Just need to find a suitable place to put the jack

Ziggy122 · Dec 14, 2012

If your unlucky like me to not have the Multi CD player, surly you can get the ""aux"" in to work like that?

Ziggy

AndyRKett · Dec 15, 2012

jmckee4 said:
Not just that, I think they look awful, even with the surround they look out of place.:yuck: Maybe a bespoke fascia which is a similar fit would look ok but obviously they don't make such a thing.

I've read a post from someone trying the same thing and apparently holding the SRC button when switching on the HU activated the changer setting so I might have a go at that. Annoying but I could live with it if it works

I have to agree I'm really not a fan of the aftermarket look, will give this a go tomorrow as if it works I'll also be buying an aux in off of eBay for my iPod, might finally get some decent sound quality. Also much better than the expensive connection kits which force you to control the iPod via the head unit controls,

I may still consider and aftermarket blupunkt unit because I fancy the idea of having DAB in the car before long

jmckee4 · Dec 15, 2012

It might not work first time, obviously there is a knack to it. You have to let go of the SRC button as soon as the HU comes on otherwise if you still have hold of the button it will do an fm scan

SweetSugarHigh · Dec 17, 2012

Go on, you know you want to...

https://www.fiatforum.com/punto-guides/243750-punto-mk2-installing-carputer-monitor-fascia-panel.html

It's easier than it looks

jmckee4 · Dec 17, 2012

SweetSugarHigh said:
Go on, you know you want to...

https://www.fiatforum.com/punto-guides/243750-punto-mk2-installing-carputer-monitor-fascia-panel.html

It's easier than it looks

Not a good idea in Bolton

Ziggy122 · Dec 17, 2012

i tried that Src button trick - got nothing
Either im not doing it right - or mine isn't able to adapt

ziggy

jmckee4 · Dec 19, 2012

Ziggy122 said:
i tried that Src button trick - got nothing
Either im not doing it right - or mine isn't able to adapt

ziggy

Thats a shame

Is it the same as this one?

jmckee4 said:

If so, hold the src button whilst switching on, as soon as the HU comes on let go of the 'On/Off' button then immediately let go of the SRC button.

It takes a few goes to get the hang of it. I still don't get it first time everytime

Ziggy122 · Dec 19, 2012

ah you have a different hu to me
it may explain why it doesn't work for me

ziggy

AndyRKett · Dec 20, 2012

I believe it's quite an old mk2 CD player not the same as would have been factory fitted

s and b · Dec 20, 2012

AndyRKett said:
I believe it's quite an old mk2 CD player not the same as would have been factory fitted

yes thats a mk2 cd player
mk2b has a proper volume pot

RdeVries · Dec 20, 2012

Tried getting my radio (mk2b) in Changer mode, but didn't work. According to the Fiat radio manual you need to press the SRC button once the unit is on (like switching to CD). Think we need to trick the HU in thinking that a CD changer is connected so it would change to the CD changer instead of the onboard CD.

Found the pinout of the CD changer connection in eLearn:

[FONT=&quot]13[/FONT]
[FONT=&quot]CD Changer DATA in[/FONT]
[FONT=&quot]14[/FONT]
[FONT=&quot]CD Changer DATA out[/FONT]
[FONT=&quot]15[/FONT]
[FONT=&quot]14V permanent for CD Changer[/FONT]
[FONT=&quot]16[/FONT]
[FONT=&quot]14V switchable for CD Changer[/FONT]
[FONT=&quot]17[/FONT]
[FONT=&quot]CD Changer DATA - (earth)[/FONT]
[FONT=&quot]18[/FONT]
[FONT=&quot]AF - input earth for CD Changer[/FONT]
[FONT=&quot]19[/FONT]
[FONT=&quot]Left AF-Input for CD Changer[/FONT]
[FONT=&quot]20[/FONT]
[FONT=&quot]Right AF-Input for CD Changer[/FONT]

The AUX cable only uses three pins, 18, 19 and 20. Now we need to find the correct pin where the CD changers sends the signal to unlock the CHANGER function at the HU.

jmckee4 · Dec 20, 2012

AndyRKett said:
I believe it's quite an old mk2 CD player not the same as would have been factory fitted

s and b said:
yes thats a mk2 cd player
mk2b has a proper volume pot

Didn't know it was a mk2 cd player as I got it off the bay. From the two styles I assumed it was the other way around

Only an active so cassette radio was factory fitted

RdeVries said:
Tried getting my radio (mk2b) in Changer mode, but didn't work. According to the Fiat radio manual you need to press the SRC button once the unit is on (like switching to CD). Think we need to trick the HU in thinking that a CD changer is connected so it would change to the CD changer instead of the onboard CD.

Found the pinout of the CD changer connection in eLearn:

[FONT=&quot]13[/FONT]
[FONT=&quot]CD Changer DATA in[/FONT]
[FONT=&quot]14[/FONT]
[FONT=&quot]CD Changer DATA out[/FONT]
[FONT=&quot]15[/FONT]
[FONT=&quot]14V permanent for CD Changer[/FONT]
[FONT=&quot]16[/FONT]
[FONT=&quot]14V switchable for CD Changer[/FONT]
[FONT=&quot]17[/FONT]
[FONT=&quot]CD Changer DATA - (earth)[/FONT]
[FONT=&quot]18[/FONT]
[FONT=&quot]AF - input earth for CD Changer[/FONT]
[FONT=&quot]19[/FONT]
[FONT=&quot]Left AF-Input for CD Changer[/FONT]
[FONT=&quot]20[/FONT]
[FONT=&quot]Right AF-Input for CD Changer[/FONT]

The AUX cable only uses three pins, 18, 19 and 20. Now we need to find the correct pin where the CD changers sends the signal to unlock the CHANGER function at the HU.

Link to labelled diagram in first post. I tried to link out pairs of pins using an unfolded paperclip (probs not safe, I know) and got nothing. Don't think I tried either of the 12v to data in or data out though. Maybe you need to link out more than 2 pins?

Good luck with it

AndyRKett · Dec 20, 2012

RdeVries said:
Found the pinout of the CD changer connection

The AUX cable only uses three pins, 18, 19 and 20. Now we need to find the correct pin where the CD changers sends the signal to unlock the CHANGER function at the HU.

Its a standard RX/TX serial connection to make it easy to address from any computer serial port (as well as from the CD changer) the protocols can be easily on the internet with a quick google search

RdeVries · Jan 28, 2013

Some new information regarding this topic:

CD changer used two wires to communicate with the head unit. TX and RX wire. It uses a Blaupunkt protocol (more information regarding this Blaupunkt CDC protocol: http://www.mictronics.de/projects/cdc-protocols/#Blaupunkt).

Found an Arduino code on the web, going to try this tomorrow! (https://github.com/Andrea81/CDCemu). According to this (http://www.gabriel-net.de/forum/showthread.php?p=243020) site, translated with Google Translate, this code should work!

They call it a CD Changer emulator, the Arduino tricks the HU so it enables the AUX inputs.

If it all works i'll write a guide

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