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Hi I know there's been lots of posts over the years about connections to the CDR23 , but reading through them I can't see an answer to my puzzle.


My car is a 04 plate 2.7 with just the front speakers in the dash , so no door speakers and no rear speakers , no cd changer and no amp. It's not a Bose system.


i have just added two rear speakers and taken the speaker wires to the ISO connector where the front speakers are also connected. This works.


i found when the unit was out that there is a connection to the yellow c1 plug which according to the wiring diagram is a line out , however line out to what ? Also not all the pins are connected , 


heres a picture , first time on the forum so hoping somebody can tell me.


thanks steve



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On the 986 the CDR23 used the speaker outputs for the basic system.  If an amp was fitted (Harman or Bose) it used the fibre optic output which connects the head unit, CD changer (if fitted) and amp in a loop.

It was the CDR22 which used the yellow plug for the line outputs for the amp.

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  • 2 years later...

Thanks for that information guys, but does anyone actually know what those 4 wires do?......


Yellow -  CAN Comfort High

Black -  CAN Comfort Low

White/Red - Wake up/Diagnosis Line

Green - Key Code In


i.e. what is CAN comfort, what is the wake up for and what is the key code in for? I can’t find any explanation of these anywhere. 
Thanks in advance,



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I also forgot to ask - does anyone know how to enable the analogue audio out directly from the brown plug on the CDR-23? Mine has the audio going out via the MOST bus and I’d like to use the analogue out instead but it appears to be disabled. 


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