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Helpful Reply2004 996 CDR23 Radio - No Sound

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Neil-R
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Neil-R PCGB Member
2022/09/23 00:52:33 (permalink)

2004 996 CDR23 Radio - No Sound

The radio on my 996 C4S has no sound. It lights up OK and picks up stations but unfortunately no sound. It is the Fibre optic unit with separate amplifier in the frunk. I am trying to establish whether it is the head unit or the amplifier at fault before I send for repair. Is there any easy way of checking? One suggestion was that I should look for a red light on the output connection on the head unit
( mine is currently not showing this) but not sure if this is reliable indicator of head unit fault. Any suggestions would be greatly appreciated as I really would like to know which item need to be sent for likely (expensive!) repair. Thanks, Neil.
Richard_Hamilton
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Re: 2004 996 CDR23 Radio - No Sound 2022/09/23 10:34:02 (permalink) ☄ Helpfulby Neil-R 2022/09/23 18:09:14
First of all, did you check the fuses?  There is a separate fuse for the amplifier - D9.

The head units are pretty reliable.  If it is lighting up and displaying stations I would be surprised if anything is wrong with it.

Do you have a CD Changer?  If so, that's another possibility.  The Head unit, Amplifier, and CDC are connected by the fibre optic loop, which transmits sound and control signals.  If either the amp or CDC go down, the sound stops.

A simple check for the CDC is to see if the cartridge ejects.  If it doesn't, then the glass fuse on the circuit board may have blown.  (The CDC needs to be taken out and the cover removed to change it).  Another option, if you don't use it, is to put a fibre optic loop on the MOST plug to eliminate it from the system.

The weak part of the audio system is the Bose amp, and it isn't uncommon for them to fail.  If everything else checks out OK, I would look for a used amplifier on eBay, or from a breaker.  I don't think there is anyone who offers a service to repair them.

Richard
2017 Cayman S & Audi RSQ3
Previous:
1989 3.2 Carrera Sport, 2012 Cayman 2.9 PDK, 2006 Cayman S, 2000 996 Turbo, 1998 996 C2, 1994 993 C2
Neil-R
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Re: 2004 996 CDR23 Radio - No Sound 2022/09/23 12:55:36 (permalink)
Thank you for your response. I have just checked CD operation. The head unit CD operates ok (Without sound) but when I push button several times for CDC nothing happens so I guess fault might be there. I will obtain a fibre optic loop and try that as suggested.  The amplifier on mine is not Bose but the Becker BE6600 DSP amplifier 996.645.331.03 , original so fault could also lie there?
Richard_Hamilton
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Re: 2004 996 CDR23 Radio - No Sound 2022/09/23 17:49:56 (permalink) ☄ Helpfulby Neil-R 2022/09/23 18:09:01
If the amplifier is faulty, causing a break in the fibre optic loop, then the CDR23 head unit will not operate the CDC.  The MOST loop transmits control signals as well as sound, hence no control over the CDC.  If it ejects the cartridge, then the CDC has power, and in my opinion is less likely to be the problem.  Try the optic loop, and at least it will eliminate the CDC, but I think it is more likely to be a problem with the amp.  Trouble is, there isn't a way to self-test it.

Richard
2017 Cayman S & Audi RSQ3
Previous:
1989 3.2 Carrera Sport, 2012 Cayman 2.9 PDK, 2006 Cayman S, 2000 996 Turbo, 1998 996 C2, 1994 993 C2
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