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Old 02-04-2007, 12:05 PM
Registered User
Join Date: Feb 2007
Location: Norway
Posts: 4
Unhappy Circuit diagram w124 230E 1991

Hi all.
I have a couple of annoying problems with my MB and if I don't manage to get them fixed soon I see no other option than sending it in to the wreckers..
That would be a shame though, and this site looks like it has helped a lot of people so I really hope you can help me too.

I don't know where to begin so I just have to take it from the beginning.

One day when I was driving i noticed that the ABS light came on and a few moments later all the lights went off along with the stereo. or, to be more correct, the stereo died when I pressed the brake and started again when I let go of it...
I stopped on the side of the road and looked in the fuse box and had to replace a fuse.

I had no idea what to do and where to look so I just left it alone since the car was working again.

A couple of weeks later the ABS light came on again and the car died.
The battery was flat.
I read in a book that the ABS warning light will light up if the battery is flat and it was.
I looked for something that was draining the battery and discovered that the cables to the generator was corroded and after polishing up those a bit I thought that the problem was solved.

Now the generator light on the dashboard lights up when the ignition is on and goes off again when I start the engine. (it never illuminated before)

Next day I drove off to uni and after about 30 Km the car stopped again.
This time the battery was NOT flat and everything seemed ok, no fuses blown, the starter worked but the damn engine did not start.

I did a few measurements with a multimeter and one thing that appears abnormal is that there is a fuse called "carburator electronics" (No 11) and if I pull the fuse out and measure the voltage across/current through i find 0V/0A at all times.

I read that the OVP might have something to do with it, is it possible to test that?

There have been small electrical "wierd" things going on from time to time before, like the outside temperature display sometimes doesn't work but the next time you start the car it's on again.

Does anyone have any tips on what I should test now?
A complete circuit diagram of my car (W124 230E -1991) would be highly appreciated too.

I have tried the ignition and it does give off a spark
The fuel pump is running when I crank the engine.
shorting pin # 30 and 87 on the fuel pump relay starts the fuel pump.

Please help and sorry about turning this post into a novel..

Kind Regards
Morgan P

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Old 02-04-2007, 02:07 PM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,363

Fuel Injection
Fuel Injection

Wiring Harness issue; ALL
Wiring Harness issue; ALL

Mercedes Wiring information / Technical Wiring Diagrams
Mercedes Wiring information / Technical Wiring Diagrams

Have a great day.
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Prototype R&D/testing:
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Old 02-05-2007, 12:47 AM
Max47's Avatar
Registered User
Join Date: Jan 2007
Posts: 43
Testing OVP...

Yes it is possible to test OVP, but if your ABS light come ON or Flikering on occasion and your car stall when decelarating at a stop. OVP might be your trouble.

Here's a thread for OVP testing:
Testing OVP

Here's an other thread to read and don't forget to fill the factsheet after you find your trouble this will help others members to SSS diagnostic:
SSS (Sudden Stalling) Factsheet

I hope this help you
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Old 02-05-2007, 05:22 PM
Registered User
Join Date: Feb 2007
Location: Norway
Posts: 4
Thumbs down

No the ABS light does not flicker or come on when i stall or decelerate.
It has only lit up three times:
*The first time a fuse was blown and after I replaced it everything went back to normal.
*The second time was when my battery was flat.
*The third time the battery was flat too.
(After this i discovered that the generator cable was not conducting.)

Isn't it correct that the ABS light will go ON if the battery is not charged enough?

Maybe i'm blind but I looked at the links you guys gave me and I couldn't find a circuit diagram for my car..I think one of those would really help me out..Or even better would be that CD-ROM that I see some people are talking about.
I went to my local Mercedes dealer and asked for circuit diagrams but he said that they were business secrets...

It does appear like someone has been messing about with the electrical system in my car, for example when I remove the fuse holder it looks like someone has been BYPASSING a lot of the fuses from underneath...
The car has been having a lot of problems before as well, we even had that SS Syndrome when we first aquired the car.
That time it was one of the controller PCBs that had a crack in the middle and one of the previous owners had tried to solder it back together again.
Sometimes it would crack open and then the car just died.
I don't know much more about that problem. It was a couple of years ago and the car was owned by my brother at the time.
If it will help at all I can ask him more details and fill out that SSS form for that incident..


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