W220 COMAND Integrated phone reception gone

[psr]

My phone reception on the COMAND system gradually got worse and then went altogether. Does anyone know where I should start looking for the problem?

 

[television]

My phone reception on the COMAND system gradually got worse and then went altogether. Does anyone know where I should start looking for the problem?

See what I can find if I can have the first 6 VIN numbers 220---

 

[psr]

Thank you. It's WDB2200752A151....

The manager in the Mercedes dealer said it could be an antenna amplifier in the COMAND unit. Not so sure about that.

 

[eric242340]

Thank you. It's WDB2200752A151....

The manager in the Mercedes dealer said it could be an antenna amplifier in the COMAND unit. Not so sure about that.

I dont believe that statement, the Command and Telephone/CD on the 220 all work on the D2B. The D2B is a fibre optic system and it links the above three items. The fibre optic cables can be easily damaged, also any problem in these three units can cause a fault in the other two. So the rule of thumb is if one system is not working OK then are the other two systems OK? That would be the first question. If the other two systems are working ok then he may have a valid point. But its not the only answer. Sorry if this post confuses you. On this subject I could go on all blooming night, its a good one to work on.

 

[television]

I dont believe that statement, the Command and Telephone/CD on the 220 all work on the D2B. The D2B is a fibre optic system and it links the above three items. The fibre optic cables can be easily damaged, also any problem in these three units can cause a fault in the other two. So the rule of thumb is if one system is not working OK then are the other two systems OK? That would be the first question. If the other two systems are working ok then he may have a valid point. But its not the only answer. Sorry if this post confuses you. On this subject I could go on all blooming night, its a good one to work on.

Eric, once again the 0DB11 is only a communication system between the modules and has nothing to do with the working of the individual modules. There are no telephone signals in the can bus as such.

 

[eric242340]

Eric, once again the 0DB11 is only a communication system between the modules and has nothing to do with the working of the individual modules. There are no telephone signals in the can bus as such.

MALCOLM, hallo and wake up, did you not read the post correctly? I never mentioned OBDII. Im talking about the D2B, and this system is nothing whatsoever to do with OBDII

 

[eric242340]

I will say this again, slowly for Malcom, The D2B is a fibre optic system and controls Command/Telephone/CD and in no way does it have anything to do with OBDII. The Fibre optic cables are prone to damage and as ive said in the previous post, if one unit is affected then there is a knock on effect. With fibre optics we are working on light emmissions and not electrical signals.

 

[television]

MALCOLM, hallo and wake up, did you not read the post correctly? I never mentioned OBDII. Im talking about the D2B, and this system is nothing whatsoever to do with OBDII

So I put a 0 in front of the D2B but it still makes no difference, this is a wake up closed circuit and has nothing to do with the failing of a component in the chain. D2B is a networking communication system, if the net working was not working, a message would come up on the command saying " not communicating with the phone" if the optics were damaged other parts of the chain would not work. The optics loop through each device.

 

[eric242340]

So I put a 0 in front of the D2B but it still makes no difference, this is a wake up closed circuit and has nothing to do with the failing of a component in the chain. D2B is a networking communication system, if the net working was not working, a message would come up on the command saying " not communicating with the phone" if the optics were damaged other parts of the chain would not work. The optics loop through each device.

No, not so, you may not get any such command answers. Do your homework and youll find the answer.

 

[television]

No, not so, you may not get any such command answers. Do your homework and youll find the answer.

Thats interesting, so when my telephone could not communicate with the command and said so it did not really mean that,
and the words "No Telephone," were just like your gobbledy gooch.

If you had understood anything about this fault you would know that fibre optics either work or they do not. There is no middle of the road as the signals are digital as such. At least I have had the privilege of working with it 10 years before it was ever used on cars.

Even if the guy with the fault had a oscilloscope it would not help him with this fault, as it is waking up.

Are you going to turn this´thread into one like the SLK ROOF, ML MIRRORS, PARKING SENSORS and a whole load more where you were totally wrong.

You have not done one thing here to help this guy, just tried to show how good you are and messed it all up.

Stick to the engineering threads you do not understand modern electrics

 

[psr]

It's only the phone reception that doesn't work and it went away gradually, so I suppose I have some kind of antenna problem.

 

[television]

It's only the phone reception that doesn't work and it went away gradually, so I suppose I have some kind of antenna problem.

An answer is coming up in 5 mins is your car before or after 2000

 

[psr]

Thanks for your help. It's a September 2000.

 

[television]

PSR there is a fault logged with the "poor telephone or none whatsoever" that you have, this one makes some sense.

The antenna lead for the wiring harness from the splitter and the antenna lead from antenna to splitter can be connected incorrectly. this all comes from the antenna in the boot lid to the connector near the rear shelf.

Another poor or no reception fault is bad contact on the antenna lead between the sheet metal panel and the rear shelf lining.

All of the above can be seen on the signal strenght on the phone.

There are other faults where the rear seat is loaded and bends one of the cables the answer here is to fit a straight plugs

 

[psr]

Malcolm,

That's helpful. I will have a look in the boot. My car was completely repainted by Mercedes and it was after that the fault began to occur, so I am wondering if they did something to cause this when they removed boot trims etc.

I'll give you an update once I have had a look.

Thanks.

PSR

 

[Rory]

Sorry if this is a bum steer, but I've seen it mentioned that some MB's have aerial amplifiers in the C posts which can be damaged by by the heat from paint baking equipment. That would fit with the gradual failure after painting.

 

[psr]

I haven't managed to get into the parcel shelf area yet - doesn't look as straightforward as an average car, but do you know what C pillar this amplifier might be in and how I should test it? If I bypassed it would I still get some weak reception?

Thank you.

 

[television]

I haven't managed to get into the parcel shelf area yet - doesn't look as straightforward as an average car, but do you know what C pillar this amplifier might be in and how I should test it? If I bypassed it would I still get some weak reception?

Thank you.

The amps on your car are not in the C pillars.

 

[psr]

Bizzare situation

Months ago I started this thread about my non-working COMAND phone. Earlier this month I drove the car in France, Italy, and Germany. The phone worked in every country, so I realized there was no problem with the phone. When I got back I tested the SIM in another handest and it logged onto Vodafone UK without problem.

My first thought was to check network selection in the handset menu. It was set to automatic, so I tried to select Vodafone UK manually, but after the "Requesting ... Requesting ..." bit it came up with "No access". Then tried reseting to factory defaults, with the same result.

Vodafone assure me there is no problem with the SIM or PAYT account. Does anyone know what the problem could be?