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Old 09-18-2007   #1 (permalink)
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Unhappy ///SRS light is on + AC is not working\\\

For a long period of time, I was driving the car and telling everyone " Maasallah (Alroumi will get that for sure) for over 3 years I did not have a single problem with the car!"

Now those 3 years are over and I don't feel lucky anymore. Everything started with tinting my driver's side window. After an idiot broke my window I replaced it then went to a tinting shop. The guy there was nice as usual, took out nearly everything in my door, tinted the window and put them all together again. After that time I started to hear rattling coming to my left ear everytime I drive. First I thought it was because of the roof tried every solution I have found in this site (felts, lubricating and other stuff) nothing changed. Then I thought maybe it was because of the locking mechanism of the door, cut out 2 pieces of rubber for each door lock and glued them to the 0 shaped part. ( I even posted photos here)First few months were OK but the last days of my holiday were just like nightmare.

The lock itself and the rubbers that I glued were dried out and the touching noises of the rubber parts were driving me crazy. I tried taping the 0 shaped part( I hope you understand the part ı am talking about) with we call "black isolation tape" but after 10 minutes of driving I was mad again.

Even that time I said to my girlfriend "Maasallah still no big problem..."

I turned on the AC and there was a smell like a somebody put dead rotten in my car. We quickly turned it off. The next day we were leaving from our holiday house and when I turned on the AC nothing happened it was just not working. No sound no air nothing the fans were not working and the strange part is everytime I tried to turn it on , I saw a red SRS light. I am not a car electronics genious but I know those parts are not built to interfere with each other.

I went to MB service yesterday and explained what had happened and told them that 6 months ago I installed mods4cars smartroof module and sprintbooster. Today I called them and a guy told me that maybe those modules were messing up the car, they had to get them off. SRS error was due to a some sensor problem under the driver's seat. They wolud replace it with a new one (110 Euros) but in order to find a solution to the AC ,those modules should not be in the system. As I expected StarDiagnostic did not cath the sprintbooster and roof module. I took the car and went to another service told the mechanic about the modules the answer was modules were interfering with the canbus of the car. When I turn the AC SRS error should not be seen. The car computer is out of its mind because of the modules. First I should get them out of the car then they would take care of the car.


What I know is after the Diagnos SRS light is always on, AC is not working, the noises are coming from both of the doors and Maasallah days are over for me for now

It is like 6 months I am driving the car with roof module and sprintbooster( I know what you feel about it Dan ), nothing happened so far. If the car is out of his mind because of those mods why did it happen after 6 months? Was the smell coming from AC because of a burning cables in the system? I don't know. I talked to the electrician who installed those 2 mods to the car and he told me that he could solve the problem and he did not think that those mods could trouble the car. Can you help me Dan what should I do?
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Old 09-18-2007   #2 (permalink)
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It may be worth the effort to remove the roof module and have MB service take a look. Is it still under warranty?
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Old 09-18-2007   #3 (permalink)
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It is not under warranty. I am not so sure that all the sh*ts happen because of the modules. I have never heard something like that
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Old 09-18-2007   #4 (permalink)
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It is not under warranty. I am not so sure that all the sh*ts happen because of the modules. I have never heard something like that
I doubt if it's related to the roof module.
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Old 09-18-2007   #5 (permalink)
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First off remove both the modules not that i think they are causing problems but its not worth the hassle of leaving them in its 2 more variables removed.

I have a few questions if you don't mind mate just to clear it up in my head.

When you turned the AC on do you mean you turned the whole climate module on or just the AC part?

If you mean the whole module and i think you do then you are sure you powered it off again it did not die on you?

That first time when you got the smell you did not get an SRS light correct?

The SRS started coming on after that first incident but only staying on while you tried to turn on the climate control?

When you look at the climate control module in its off state currently do you still have a red light on the off button (if you have the luxury climate system that is) if you don't have lux climate then do the red LED's come on around the controls when you try and power it up?

The sensor they replaced sounds like the occupancy sensor but when they go they go you cant get the light to flicker by pressing buttons, the reason the SRS light is fixed on now could be because the sensor was not changed correctly and is still logging a fault or because they did not reset it after the change.

The fact that you had the light come on when trying to start the climate and you had a weird smell suggest wiring faults, was the smell coming from the vents themselves of was it just appearing in the cockpit slowly (smells that start inside the heater box are normally blown onto you rapidly because of the air flow inside)?

First thing i would do is remove the modules then check all the fuses relating to the SRS (ARMADA) and the climate control / fan's do this with the key removed after about 10 minutes of waiting with the bonnet up.

If the fuses are all good then next i would pop the ac module out from the dash and inspect its wiring, if you remove the control panel above it also you will have a good view of the SRS wiring behind it then do a visual check for damage.

If you see either a blown fuse or damaged wiring do not use the car because the squib and light wiring join the main harness along with the AC wiring and f the light wire is damaged then chance says the squib wiring could be also and the last thing you need is an airbag firing in your face.

If you don't see either take the car to the dealer and let them put it on the SDS see what faults it finds then address them.

The wiring is fragile in fact we have a system at the shop where we add extra insulation to all the wiring bundles we have access to when working on cars FOC to address the situation, i wanted to upload pics of it in my tech thread but was in a rush when i was putting the car back together again.

It only takes one routing error when working on the car and the thin wall insulation will wear away real fast.

Also take the passenger under dash panel out and check the main power line to the blower.

The fact you had in icky smell associated with failure has me a tad concerned about the car really, most faults are electronic in nature and just the result of new technology begin pushed out before its mature but real electric problems can be very dangerous.
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Old 09-18-2007   #6 (permalink)
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I would not have mentioned either of the modules. I would have disabled the roof module (don't know about the other module). Then let the MECHANIC find out what is wrong. Just give them the symptoms. Saying that you added something is just going to give them an excuse to say that was it and not find the real problem. IMHO.
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Old 09-19-2007   #7 (permalink)
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First off remove both the modules not that i think they are causing problems but its not worth the hassle of leaving them in its 2 more variables removed.

I have a few questions if you don't mind mate just to clear it up in my head.

When you turned the AC on do you mean you turned the whole climate module on or just the AC part?

If you mean the whole module and i think you do then you are sure you powered it off again it did not die on you?

That first time when you got the smell you did not get an SRS light correct?

The SRS started coming on after that first incident but only staying on while you tried to turn on the climate control?

When you look at the climate control module in its off state currently do you still have a red light on the off button (if you have the luxury climate system that is) if you don't have lux climate then do the red LED's come on around the controls when you try and power it up?

The sensor they replaced sounds like the occupancy sensor but when they go they go you cant get the light to flicker by pressing buttons, the reason the SRS light is fixed on now could be because the sensor was not changed correctly and is still logging a fault or because they did not reset it after the change.

The fact that you had the light come on when trying to start the climate and you had a weird smell suggest wiring faults, was the smell coming from the vents themselves of was it just appearing in the cockpit slowly (smells that start inside the heater box are normally blown onto you rapidly because of the air flow inside)?

First thing i would do is remove the modules then check all the fuses relating to the SRS (ARMADA) and the climate control / fan's do this with the key removed after about 10 minutes of waiting with the bonnet up.

If the fuses are all good then next i would pop the ac module out from the dash and inspect its wiring, if you remove the control panel above it also you will have a good view of the SRS wiring behind it then do a visual check for damage.

If you see either a blown fuse or damaged wiring do not use the car because the squib and light wiring join the main harness along with the AC wiring and f the light wire is damaged then chance says the squib wiring could be also and the last thing you need is an airbag firing in your face.

If you don't see either take the car to the dealer and let them put it on the SDS see what faults it finds then address them.

The wiring is fragile in fact we have a system at the shop where we add extra insulation to all the wiring bundles we have access to when working on cars FOC to address the situation, i wanted to upload pics of it in my tech thread but was in a rush when i was putting the car back together again.

It only takes one routing error when working on the car and the thin wall insulation will wear away real fast.

Also take the passenger under dash panel out and check the main power line to the blower.

The fact you had in icky smell associated with failure has me a tad concerned about the car really, most faults are electronic in nature and just the result of new technology begin pushed out before its mature but real electric problems can be very dangerous.
Well my climate controller is not digital, there are 4 levels on it and when I turned the button to 1 the SRS error was there. AC light was working and was on when I pushed it but SRS error occured when I turned the fan button between 1 and 4.

SRS light is fixed now because they did not change the sensor in the service.

about the smell I am not %100 sure but my girlfriend told me that it was coming from passenger side vent maybe it was coming somewhere from the passenger side.

I am really concerned about the car now. I will get the modules out and solve the problem Dan. Thank you very much.
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Old 09-19-2007   #8 (permalink)
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I would not have mentioned either of the modules. I would have disabled the roof module (don't know about the other module). Then let the MECHANIC find out what is wrong. Just give them the symptoms. Saying that you added something is just going to give them an excuse to say that was it and not find the real problem. IMHO.
you are right but what if those modules were causing the problem ? They would take out everything in the cabin and I will be the one who pays for their sh*t...
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Old 09-19-2007   #9 (permalink)
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It would be good to remove the modules but i can say with 99% certainty its not going to be the sprint booster because it sits on the lines from the potentiometer to the ECU and does not communicate on CANBUS.

Cant be so sure about the roof module because it does use CAN, still even if it was causing problems that does not explain the smell any faults it would cause other than faults on its own wiring would be purely electronic i.e it would effect the computers not the wiring.

So just to confirm the SRS is now fixed it does not come on when using the climate control system?

When you use the climate control does it work properly? / do you get the lights on the control unit / does it stay totally dead?

Depending on how handy you are with a torx bit screwdriver i would gut as much of the dash as possible its just held together with screws, if your GF thought it was on the passenger side then that's easier to work with because it has less wiring that side.

Just look for damage to the insulation, remove as many plugs as you can and inspect the connections (not the yellow ones!) if she thought it was coming from the vent then it could be the fan motor thats located in the pass footwell.

Could also be something non electrical if your climate control is now working properly maybe a clogged filter or a broken drain line.

Until you sort the problem i would only use the car for journeys you 100% need to do, no point in taking risks.
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Old 09-19-2007   #10 (permalink)
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Today everything is solved. Dumb MB services could not get it so I went to my local service and electrician. They told me what happened to the car without touching it. Under the right aerowing there is some kind of pipe for rain and water to pass by. At the end of the pipe is cone shaped. Because my car seats in its place most of the time leaves and dust filled the end of this gate. So water ran through our climate resistance and all of the thing was nearly oxidated. He changed the part cleaned other oxidated parts and that was it. AC was working! He told me it is the most common problem he repairs in MB cars and pull out my right front wheel cut the end of the pipe straight so water can flow easily. He told me that in E class that water pipe was on the left and when it stuck with dirt water could damage the main electronic units of the car! Thats why I am going to take our E class to him next week! I saw the process with my own eyes I am pretty sure most of your cars are built like these. I strongly to recommend to do this simple mod!

For SRS I found out that those error could occur when you jump on your seat or 150 kg man sits in your seat. He told me that the SRS sendor is so thin like a piece of paper and harsh movements on the seat could trigger the sensor. After SDS everything was perfect again. Even noice coming from driver door is gone. The car is in Maasallah condition once again.

MB services here are not open minded and talways think that whatever hapens is firs your fault. Thank you Dan once again for your informative reply. Maybe my English is not sufficient for explaining that waste water outlet in MB cars but I know you will understand and write something for everyone, please take care of that problem in your car. It can happen to you...
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Old 09-19-2007   #11 (permalink)
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Originally Posted by diclehana View Post
Today everything is solved. Dumb Mercedes Benz services could not get it so I went to my local service and electrician. They told me what happened to the car without touching it. Under the right aerowing there is some kind of pipe for rain and water to pass by. At the end of the pipe is cone shaped. Because my car seats in its place most of the time leaves and dust filled the end of this gate. So water ran through our climate resistance and all of the thing was nearly oxidated. He changed the part cleaned other oxidated parts and that was it. AC was working! He told me it is the most common problem he repairs in Mercedes Benz cars and pull out my right front wheel cut the end of the pipe straight so water can flow easily. He told me that in E class that water pipe was on the left and when it stuck with dirt water could damage the main electronic units of the car! Thats why I am going to take our E class to him next week! I saw the process with my own eyes I am pretty sure most of your cars are built like these. I strongly to recommend to do this simple mod!

For SRS I found out that those error could occur when you jump on your seat or 150 kg man sits in your seat. He told me that the SRS sendor is so thin like a piece of paper and harsh movements on the seat could trigger the sensor. After SDS everything was perfect again. Even noice coming from driver door is gone. The car is in Maasallah condition once again.

MB services here are not open minded and talways think that whatever hapens is firs your fault. Thank you Dan once again for your informative reply. Maybe my English is not sufficient for explaining that waste water outlet in MB cars but I know you will understand and write something for everyone, please take care of that problem in your car. It can happen to you...
Thank you very much for your post on this matter Diclehana. If it is possible to post pix of the repair/fix to the drain pipe/tube, that would be very helpful.

Under the right aerowing area is a cover over the battery and the water and debris is directed to one corner and I think this drains to a drainange pipe/tube to the rear of the right front wheel well. A pix on how this cone-shape pipe was cut would be very much appreciated.
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Old 09-19-2007   #12 (permalink)
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Ah you mean the drain from the battery box so once it got plugged it ran down the intake into the AC.

Thats the only one i can think of that would damage the AC because the other side drains in front of the seal and runs down another pipe.

Water runs down past the wings onto the little holder then down the opening in it onto the battery box floor and from there down the tube to the floor, are we talking about the same vent?
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Old 09-19-2007   #13 (permalink)
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Yes exactly same thing..
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Old 09-19-2007   #14 (permalink)
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Cool so what you smelt was an electrical short circuit melting components then because the fan motor was full of water
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