As you know by now, your complete loss of audio and your CDC problem are independent. There is a fuse for the Bose amplifier, but not separate fuses I am aware of for the individual CDC functions. Removing just the fuse will avoid other problems you may incur with battery disconnection. Just in case you experience other oddities, see post #14 at http://www.benzworld.org/forums/w220-s-class/1302190-ive-had-post2216730.html

Your fuse diagram is usually somewhere in the tool kit in your spare tire well. If you lack it (often wrapped around one of the tools) see http://www.benzworld.org/forums/w220-s-class/1219691-fuse-chart-2.html

The CDC problem sounds like one described at CD Changer Repair : Miko's Weblog alternatively it could be a sensor in the player, telling it that a disc is present. It's a common problem - I suggest repair. There are a number of radio shops that repair MB radios - a Google search on "Mercedes radio repair" will get them for you. USA MBDoctor Mercedes Benz OEM electronics parts and devices. is one, for new and repaired equipment; http://www.mercedesradiorepair.com/ may be able to repair your own equipment.

Although it wasn't the problem in this case, it's a good thing to check fiber optic leads if you experience sound loss or loss of items on the fiber optic ring; see the phone bulletin for your car at Phone Bulletins for locations.

It was definitely not a "COMAND Code" issue. COMAND doesn't use a "radio" code.

You have a COMAND 2.5 system that uses CD navigation. There are two types of nav system used in '00 - a "C" (used through October '99 production and into November) and a "D" (used from November '99 and on). The placard on your driver's door sill gives the date of manufacture of your car. The CDs for each type are not compatible. You can identify whether you have "C" or "D" nav for certain at D-Nav? - MBWorld.org Forums. Sometimes, malfunctioning "C" navs have been replaced with "D" navs, so date of manufacture is not always accurate as a guide.

Information on the latest CD sets is at post #3 at http://www.benzworld.org/forums/w220-s-class/1388984-2001-s500-navigation-cd-maps-question.html and post #22 at http://www.benzworld.org/forums/audio-telematics-forum/1333871-comand-questions-3.html.

C-nav discs are hard to find; no update since '04. Some dealers may be still able to get them; otherwise, this forum or e-bay are your bets.

NavTeq no longer lists the D-nav discs on its site. Dealers still have them. Alternative sources are the same as for C-nav.

The 10-year warranty applies only to the instrument cluster, with the speedo, tach, warning lights, multifunction display, etc. It does not cover your COMAND unit or its screen.

 

Hi SkyLaw thanks for the most informative post and attached links...I am a bit discouraged at the "school of electronic design" where is is a VERY BAD thing to disconnect the battery ground. It seems things are getting more complicated than they should be and designers shold work to come up with systems that don't reqiure all that resetting it really is a bit absurd if one thinks about it. When you just open up the door or trunk lid there are always some motors running or relays clicking---amazing is all of this necessary? Guess you have to love the technology.

Well more on this as soon as I have time to try a few things out on the CD changer.

THanks again for your great kindness in posting and replying to my call for assistance.

 

I have the same issues with my radio. Car is a 2001 S500 AMG. Sound is intermittant and then goes silent. When I hit the CD button I get a no CD. Turn the unit off for a few minutes, then turn it on. Brief sound and then goes intermittant or silent.

Would it be a good idea to disconnect the battery like the original poster did? Or, bring it to the Stealer?

Any suggestions most appreciated - thanks!

 

Hi all, help!
I have again an audio problem with my W220 year2000. This time, sound comes few seconds only and then off for 15 to 20seconds then back again for few seconds. I have tried disconnected the all cables including F-optic cables on command, CD changer, and Amp. But the problem remains. I will appreciate if someone can tell the way to solve my issue. Thanks

 

sound problem!!!!



Please help! I have the same problem! The sound is low and then disappears!!!:surrender:

 

When that was happening in my '00 W220, a COMAND firmware reload by the dealer cured the problem.

 

Check the "No Audio" troubleshooting steps in post #3, http://www.benzworld.org/forums/w220-s-class/1508080-w220-s-class-encyclopedia-start-here.html - it's not a place you'd ordinarily look, but you may find it helpful. One cannot simply disconnect fiber optics; they must be bypassed/spliced as the steps describe.

 

welp, was listening to some tunes on the way down the highway today when my sound went out. now i get the " no cd changer found" message. im done. i WAS gonna upgrade and get a mercedes 40 player for mpg's and hook it up. not now. im done with this fiber optic stuff. gonna bite the bullet. get my car MECANICALLY sound and then invest in a aftermarket head unit and be done with this fiber optic stuff.....

 

The post immediately preceding yours applies to the problem you describe as well. You're looking at the cost of the mp40 unit versus about $5,000 to do a 3rd party installation properly.

 

found a shop in the atlanta area that has done these cars. they specialize in high end car installation. they told me over the phone EXACTLY whats in the car and what they recommend. gonna cost ( nowhere near 5,000) but i have had several quotes in the past close to that. ive made up my mind about the whether to stay stock or not.

i originally was gonna keep the car and sell it, thus, was leaning toward the mp40 unit. im keeping the car now, thus, im gonna get my mechanicals straight THEN either do it myself or invest in a aftermarket system. i want bluetooth, navigation, etc. the shop recommended i keep the factory subwoofer ( he explained that he knows about the factory parameters, etc.) and replace everything else. if i could do myself, i would. ive made a post already in the general w220 forum about wanting to know the location of the factory wiring from the oem headunit back to the trunk before i decide whether i can handle this job or not. dont wanna have to remove front seats if i dont have to , etc.

i was quoted about $2,000 if i keep the factory sub and the factory speakers. the gear is a new headunit and new amp, with whatever accessories i need. if i do the labor myself, i should save a ton off that $2,000 price.

 

I found the guy to help. His name is Bob from Factor Car Stereo Repair (Factory Car Stereo Repair, Inc. - BOSE Stereo and Speaker / Amplifier Repair). There is a terrific video explaining the fiber optic system in the Mercedes. While the video was helpful, I called and spoke to Bob who was even more helpful. The solution to no sound is the fiber optic circuit is broken at one of five modules. Mine was clearly the CD changer. Via a $7.00 coupler from my local Mercedes dealer. I had the sound back on. Since I use an iPod to play through the stereo, I don’t miss the CD changer. But, Bob would probably fix that for you as well.

 

Thank you - that is a concise explanation. Noting that you posted this in sub-forums for several different models, I don't really know what kind of car had the problem you address. However, if it was a W220, this is pretty thoroughly explained, together with links to DIY troubleshooting steps (including using the coupler) in the W220 S-Class Encyclopedia sticky under "No Audio."

 

Warren,
I apologize for multiple postings. I was so excited to share a solution to the numerous threads I found prior to speaking with Bob that didn't really offer a solution. My vehicle is a 2003 ML350. But, the Bose fiber optics were used across models I believe. In any case, Bob can be a terrific contact for anyone having Mercedes car stereo issues.

 

No biggie - you're spreading the good word, and with an ML, you would not have been looking at the W220 Encyclopedia anyway. And it was indeed a concise explanation!