I had this very problem. It has been annoying me for months, looking for a replacement command unit, until I finally found one. Plugged it in and same problem. I did not know about the phone module. Then, by accident, I found your video and yes my issue was the phone module gone bad. All good now. Thank you.
@@zondi27 my problem was due to the phone module that is linked into the optical system. It's located underneath the rear seats. It needs an optical bridge to test and replace the module. As on ebay.
Great explanation. Thank you. I have lost sound from my gl450 2007. The radio/cd turn on and appear to be working but no sound. Checked the amp--it looked good. No water damage anywhere. So it must be one of these modules.
Hi everyone, thanks for your kind comments. A Common question that comes about is regarding the Fibre optic shunt tool (bypass cable) also the name of the item they should search for? These items are very much available at a very cheap price from eBay and many other onliine sellers. Try perhaps on eBay e.g. typing "MOST Fibre optic shunt" or "MOST Fibre optic loop bypass cable" These items are an essential item for your tool box for testing and eliminating many issues for Mercedes, BMW, Jaguar / Range Rover, Audi and many other vehicles that Run on the M.O.S.T optic platform. Earlier Mercedes (Pre 2001-4) run on the older D2B Fibre Optic format, completely different to M.O.S.T. but principally the same method to loop out and diagnose a faulty component. For those that are confused how on earth this complex system works? Imagine each component (Module) on your vehicle that makes up the complex audio system and much more. Try to liken this system as if it were like a central heating system, a system with ten or more water fed radiators that all have to work as a team to feed heat and water through them to complete the chain. You block or remove one radiator, the rest are starved and the rest of the system cannot work as the one behind cannot feed with water (in this case optic data) similar to why only half your Christmas lights work and the rest are out!? MOST Fibre optic system is very similar, it is a process of elimination, one of which you will need to know exactly the spec of your vehicle and what components you have to make the system on your particular vehicle. Imagine the audio head unit (or Comand unit) on your Mercedes is the engine, or rather the boiler pump, this unit will distribute audio and other data to other components, optic signal in, optic signal out to another component, optic signal in & optic signal out & so on to the next component (same as central heating radiators) water feed in, then the return feed out and so on. As you saw in this video I made with this particular Mercedes ML the component that was at fault was the Cellular Phone comms unit, when any of the coponents that make up the important chain become faulty or fail for what ever reason, they will break this imoprtant chain and will starve the other important components down the line, yes ultimately the audio amplifier (that is usually last in the chain) Some obvious item to check - test - eliminate from the system (with experience) are. DVD - CD Rom Navigation units, Multi CD - CDC changer units (E class and CLS mounted below audio head unit- usaully motorised) any outher units such as emergencency cellular location device modules, Cell phone HF modules, any one of thes could be the issue for thew failiure of you audio system, everyone will first assume the audio amplifier or gateway module, no not very often unless the vehicle has suffered extreme water ingress or flood damage - then anything or more than one component could be the culprit! For example, Range Rover L322 2005 onward have same issues, usually the Nokia Bluetooth HF Module mounted in the boot fails, this will F@ck up the whole system, or the glove box mounted CDC (CD Changer unit) Eliminate this with the shunt tool and whole system comes back to life! Best of luck with this knowledge and really hope it is of help to you all!
great video and explanation there will be 8 yr olds fixing merc audi stereo systems before we know it lol . i have had an issue with the module and motor that control the automatic tail gate opener do you think this cauld be the issue?
Great video. The volume buttons on the steering wheel on my ML work, but not the volume knob on the radio. What would you think may be the cause in this case. Thanks.
My 2006 Mercedes CLK350 has a similar problem- I put in a DVD in the Navigator cd player and it got stuck. Now I have nothing but hope I can repair it.
Can you help out ? I can't locate the actual module for the audio/navigation/CD system in my C350 - 2006. I have a problem with my audio system as it keeps switching off. I noticed many have similar problems & they fibreloop it. I looked in the boot & under the rear seat & found nothing. Is there a link to the diagram ?
I am having a similar issue. The Mercedes logo is stuck on display. I can insert a cd and it will play but nothing else. The screen just stays stuck on the logo. No radio, no Navi none of the buttons work except the eject button. The volume buttons and the arrows buttons on steering wheel are not working. I do have volume when playing cd
Hello and thank you in advance for your answer :) I have the same problem with my ML 320CDI-06 and am curious if bridging with this cable will restore all functions on the APS COMAND (navigation, rear view camera, CD changer). ) and I can be used, or does the radio only work again?
My command unit gets stuck on the boot screen, and I know it's the Navigation unit. Where is the MOST connector for that located ? I'd like to add a bypass loop onto it. Thanks !
Hello, I have the same car and the same problem, I have put the cable but I still have the same problem that it turns off by itself, what else can I do?
Hi, the problem could be the amplifier that has failed, amp situated under the passenger seat (UK) vehicles, you could try capping the amp out of circuit, if it solves the command unit non booting issue you have no sound but you will know its the amp thats at fault, or something else on the fibre optic MOST ring
I keep them for use in the workshop for Mercedes, Bmw, Range Rover, Audi, Porsche etc, I keep the unused parts when I install Dension Gateway etc, they are available on eBay I'm sure
I had this very problem. It has been annoying me for months, looking for a replacement command unit, until I finally found one. Plugged it in and same problem. I did not know about the phone module.
Then, by accident, I found your video and yes my issue was the phone module gone bad.
All good now. Thank you.
How did you fix your problem? I have the same problem now and I dunno where I could find the Loop thingy
@@zondi27 my problem was due to the phone module that is linked into the optical system. It's located underneath the rear seats. It needs an optical bridge to test and replace the module. As on ebay.
Excellent! I’m so pleased my video helped you 😄
Great explanation. Thank you. I have lost sound from my gl450 2007. The radio/cd turn on and appear to be working but no sound. Checked the amp--it looked good. No water damage anywhere. So it must be one of these modules.
Perfect the best and short lesson
Hi everyone, thanks for your kind comments. A Common question that comes about is regarding the Fibre optic shunt tool (bypass cable) also the name of the item they should search for?
These items are very much available at a very cheap price from eBay and many other onliine sellers. Try perhaps on eBay e.g. typing "MOST Fibre optic shunt" or "MOST Fibre optic loop bypass cable"
These items are an essential item for your tool box for testing and eliminating many issues for Mercedes, BMW, Jaguar / Range Rover, Audi and many other vehicles that Run on the M.O.S.T optic platform. Earlier Mercedes (Pre 2001-4) run on the older D2B Fibre Optic format, completely different to M.O.S.T. but principally the same method to loop out and diagnose a faulty component.
For those that are confused how on earth this complex system works? Imagine each component (Module) on your vehicle that makes up the complex audio system and much more. Try to liken this system as if it were like a central heating system, a system with ten or more water fed radiators that all have to work as a team to feed heat and water through them to complete the chain.
You block or remove one radiator, the rest are starved and the rest of the system cannot work as the one behind cannot feed with water (in this case optic data) similar to why only half your Christmas lights work and the rest are out!? MOST Fibre optic system is very similar, it is a process of elimination, one of which you will need to know exactly the spec of your vehicle and what components you have to make the system on your particular vehicle. Imagine the audio head unit (or Comand unit) on your Mercedes is the engine, or rather the boiler pump, this unit will distribute audio and other data to other components, optic signal in, optic signal out to another component, optic signal in & optic signal out & so on to the next component (same as central heating radiators) water feed in, then the return feed out and so on. As you saw in this video I made with this particular Mercedes ML the component that was at fault was the Cellular Phone comms unit, when any of the coponents that make up the important chain become faulty or fail for what ever reason, they will break this imoprtant chain and will starve the other important components down the line, yes ultimately the audio amplifier (that is usually last in the chain)
Some obvious item to check - test - eliminate from the system (with experience) are. DVD - CD Rom Navigation units, Multi CD - CDC changer units (E class and CLS mounted below audio head unit- usaully motorised) any outher units such as emergencency cellular location device modules, Cell phone HF modules, any one of thes could be the issue for thew failiure of you audio system, everyone will first assume the audio amplifier or gateway module, no not very often unless the vehicle has suffered extreme water ingress or flood damage - then anything or more than one component could be the culprit! For example, Range Rover L322 2005 onward have same issues, usually the Nokia Bluetooth HF Module mounted in the boot fails, this will F@ck up the whole system, or the glove box mounted CDC (CD Changer unit) Eliminate this with the shunt tool and whole system comes back to life! Best of luck with this knowledge and really hope it is of help to you all!
great video and explanation there will be 8 yr olds fixing merc audi stereo systems before we know it lol .
i have had an issue with the module and motor that control the automatic tail gate opener do you think this cauld be the issue?
Thanks for the video i got the same problem I’m going to fix it now
Legend, thanks for this mate !
Thanks for the comment, I hope this helped you out sorting your problem!
can we get a link for this cable man ? Thx 👍🏻
Great video. The volume buttons on the steering wheel on my ML work, but not the volume knob on the radio. What would you think may be the cause in this case. Thanks.
Hi, i found something like that under back passeger side, and bypassed it, but did not work...may be it was for blutooth only...
My 2006 Mercedes CLK350 has a similar problem- I put in a DVD in the Navigator cd player and it got stuck. Now I have nothing but hope I can repair it.
Where are we able to get the cable, our is doing the same problem
Hi have same problem my car buy yesterday how name cable pls im buy it thank you so much for video
Hi, I have the same problem on my 2008 Gl320 do you think this cable will work?
I have the same problem but i have a B200 cdi with the NTG2 but i don't have this calculator i think it's the CD chargor in the passenger box
Can you help out ? I can't locate the actual module for the audio/navigation/CD system in my C350 - 2006. I have a problem with my audio system as it keeps switching off. I noticed many have similar problems & they fibreloop it. I looked in the boot & under the rear seat & found nothing. Is there a link to the diagram ?
I am having a similar issue. The Mercedes logo is stuck on display. I can insert a cd and it will play but nothing else. The screen just stays stuck on the logo. No radio, no Navi none of the buttons work except the eject button. The volume buttons and the arrows buttons on steering wheel are not working. I do have volume when playing cd
Same issue did u ever figure this out?
Having the same issue
Hello and thank you in advance for your answer :) I have the same problem with my ML 320CDI-06 and am curious if bridging with this cable will restore all functions on the APS COMAND (navigation, rear view camera, CD changer). ) and I can be used, or does the radio only work again?
How name cable ?
I have thesame problem what exact cable did u get...
Hi , i did the same problem but the problem remained. Does anyone know how it can be removed.
Hello friend can you untie this cable and switch it on without a converter?
Mine has the sound of a radio channel but it’s stuck on the emblem
What could it be ?
Hi, I have Mercedes R 320, the same problem, but I don't find the place of that phone module . Can someone help me please?
My command unit gets stuck on the boot screen, and I know it's the Navigation unit. Where is the MOST connector for that located ? I'd like to add a bypass loop onto it. Thanks !
where can I buy such a connector?
Is it male or female this fibre optic cable?
Female
Hello, I have the same car and the same problem, I have put the cable but I still have the same problem that it turns off by itself, what else can I do?
Hi, the problem could be the amplifier that has failed, amp situated under the passenger seat (UK) vehicles, you could try capping the amp out of circuit, if it solves the command unit non booting issue you have no sound but you will know its the amp thats at fault, or something else on the fibre optic MOST ring
@@whitstableguy1 Thanks for answering, could you make a video to know exactly which cable is under the passenger seat.
hello or can we find this cable for sale? what’s the name? I have the same problem with my car radio thanks in advance
Yes you can find these on ebay for about $10. Just search for "fiber optic loop male female Mercedes" and there are plenty out there. Cheers.
Gdzie kupić taki światłowód
Bro my car c220 w203 this same problem. Can you help me please ?
did you solve the problem and in what way? I have the same problem.
Buona sera anche io lo stesso problema
Where did you buy the fiber optic re route cable?
I keep them for use in the workshop for Mercedes, Bmw, Range Rover, Audi, Porsche etc, I keep the unused parts when I install Dension Gateway etc, they are available on eBay I'm sure
Lwl Most Bus féminin ponts Connecteur Lumière chef Connector Pour VW BMW Benz Audi
And where I can find this cabel????
They are available on eBay, search for “MOST Fibre Optic loop” (Female) e.g. item nr 202340236441
@@whitstableguy1 thank you very much my friend
Hi l'm this problem t want le name this cable
Learn to spell dude
Wie heißt dieses kabel ?