Hey guys,

I am hoping someone has seen this before. My 2000 S430 Comand system produces no audio and displays "no cd changer". I am pretty good at troubleshooting most mechanical things but with the D2B system on this car I have no idea where to begin. I did test the amp for 12 volt across the fuse and the COMAND sytem fuctions as normal - just without sound. Does anyone have any ideas on where I might start looking?

Thanks!

Brian

Brian- i bought a new casette for the changer on ebay for 10 bucks. My changer is now recognized and everything works like it should.--JEFF

__________________
1999 C280 Sport, 1967 911s Porsche

Does the car have a phone or Voice control?
Do you have any Tele-aid faults showing?
Find the fuse chart in with the tools and pull out these
fuses. 18, 61, 63, 64, and 66.
Let the car sit for 20 min and put fuses back.
Hopefully the ring will reset and comeback.
If not, there is a hard fault with a D2B component.
We have a special tool at the dealer called the Berger Tester
that can be substituted for a suspect item.
It is basicly a D2B repeater.
Good Luck.
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

Thanks for the replies. It does have a phone and teleaid however no faults are showing. I pulled the comand unit and checked for the 4 light lock pulse. looked good and strong. Next I checked the 4 light pulse at the end of the fiber before the first D2B component. looked good. Then checked the light pulse after the first component. ok again. the next D2B component was the amp. I heard it click four times but no light exiting the amp fiber. I strongly suspect the amp is dead. I have reset the D2B ring through the head unit diagnostic menu. I ordered a nw amp from ebay. Ill let you guys know how it turns out.

Thanks

Be carefull. The Phone PSE and VAD voice control units are very common for locking up. Does the Bose amp have light output at the D2B connection
on the amp itself?
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

Dr.D,

No light output from the amp. I can see the four flash ring lock at the optic line going into the amp, I can hear the amp click four times, but then their is no light output from the amp.

Can you tell me where the voice control module is located? I am guessing it is somewhere near the phone?

Thanks for all your help!

Brian

There's some D2B ring diagnostics built into COMMAND in a "secret" menu by holding "Mute" + "1" + "2" for several seconds (or it may be "Mute" + "1" + "3").

To add to Bryan's post:

Hit 'SVC' > 'Aux' > Hold Mute, 1, 3 together for 5 seconds or so.

This is for a COMAND 2.0 system. Within that menu is a diagnostics where you can reset the system.

Good Luck

__________________
-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi

Brian,
Sounds like the FOT in the Bose amp is dead. (Fiber Optic Transciever).
I hope your EBAY amp works for you.
The VAD unit is the small black plastic box with D2B fibers mounted sideways
next to the AMP and CD changer. It is the size of a CD canger magazine.
Regards,
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

Dr. D,

Thanks for the reply. I have my fingers crossed that the amp will do the trick. If not, I may have to take it in. I will keep you guys posted as to the fix. I ran the D2B diagnostics last night. Cleared the old codes from the COMAND and the only new code it set was, of course, D2b master cannot communicate with the predecessor device. Everything points to the amp...

Thanks again,
Brian

While we're on this topic I might as well ask the question: if I add a CD changer (just bought one off Ebay) to my COMAND 2.0 loop that was not configured with one at the factory do I need to program it into the system with SDS or will it be recognized by the master (COMAND unit) upon plugin? The system does not have a telephone.

Thanks

__________________
-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi

It will work when the key is cycled and the head unit is restarted.
It should be coded with the factory SDS machine, otherwise there could
be intermittant audio issues with the system and a current fault code.
It should....should work anyways.
DR.D

__________________
Dr.Diesel -
Shop Foreman
Master Guild Mercedes-Benz Technician.

Think the dealer is expensive? Do you know how much it costs to train a dealer tech? Or buy the required MB special tools to have on hand?

Dr. D,

Havent installed the new amp yet but I did notice something else that is weird. When I run the D2B wakeup on the COMAND it will not wake any of the components on the ring up. The repair manual I was using said to be sure the optical ring was open before performing the test - so I left it open.

Do you think this is consistent with the amp being dead?

Thanks for all your help!

You could take the amp out of the loop by connecting the TX and RX fibers together and re-run the diagnostics.

BryanM,

I will try that. Can you pry open the d2b connector fairly easily or is there a better way to do it rather than taking it apart?

Thanks