Audio system - no sound

[jhskwon]

2004 911 40th Anniversary Edition.

 

Recently tried to jump start the car and accidentally reverse the + and - during clamping. The entire system shorted. Replaced the fuse including the fuse behind the PCM module.

Navigation and other work fine once the fuses were replaced, but no sound. The error message: CD-changer, Amplifier not found.... (Amplifier model: 996.645.333.05)

 

The auto mechanic told me that I may need to change the amp and/or CD-changer because it is fiber optics system. Any suggestions on fixing this problem?

 

Thank you in advance for your help...

Edited April 30, 2015 by jhskwon

[Loren]

And the fuse on the amp?

[jhskwon]

Is there a fuse on the amp? I remove the amp, but wasn't able to locate any fuses. 

[IslaTurbine]

I can't remember if there is a fuse on the amp, but did you remove the amp from the amp bracket? It could be hidden out of sight. 

[jhskwon]

I can't find a fuse on the amp. Is there a fuse on the amp? Anyone know?

[Richard Hamilton]

Not sure about the amp, but there is a small glass fuse on the circuit board in the CD Changer, which can blow under the circumstances you describe. You have to remove the CDC and remove the covers to access it IIRC.

If there is no power on the amp or CDC then the MOST loop cant transmit signals between the devices, and you get those error messages.

[jhskwon]

Dear Richard,

 

You are right. The glass fuse on the back of the CD changer was burned out. However, after replacing the fuse the CD Changer still didn't work. It seems that there is no power when checked with multimeter. Also when I press CD changer cartridge eject button, there is no response. Meaning no power. Any ideas?

[jhskwon]

The audio problem is fixed in a strange way. The problem started when I tried to jump start the car and accidentally reverse the electrical polarity. It burned audio fuse in the fuse box as well as the fuse in the PCM module. Still the audio didn't work, showing message "The error message: CD-changer, Amplifier not found..". Tried with replacement amp and cd-changer, but still didn't work. The other problem I had was that the Car won't take gas even the gas tank was empty. Found out from the forum that E6 fuse in the fuse box will solve the problem and it did... The funny thing is that when I replaced the E6 fuse, the audio system started to work. And is now working just fine. I don't know if E6 fuse has something to do with the audio system, but I just want to share for those who may have the same problem.  

[judgejon]

Congrats on your success.

I was going to suggest checking to see if there was another in-line fuse added to the sound system possibly located behind the console.

The fuel filler issue has been noted on the forums before.  See the posts re my own issue with the gas tank filler tube that would not open because the wire at the top of the gas tank leading to the little switch was chewed apart by a mouse that had built a cozy nest above the tank just under the battery tray.

I didn't realize the E6 fuse was connected to the audio system.  Write this one up as another of those "mysterious Porsche issues" that pop up every now and then.

And add to the list of coincidences that my wife and I are Anaheim High graduates who celebrated our 50th class reunions in 2014 and 2015 respectively.  Cheers!

[TAZ40JAHRE]

The audio problem is fixed in a strange way...[/font][/color]

I'm glad that you were able to address this.

On a separate note, please check your messages (I sent you one). I have a 40th, too, and had some questions that I hope you can help with. Thanks.