W204 C Class electrical fault

Chris Finlay

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2009 W204 C Class C180 M271
Hello everyone.

My name is Chris and I'm new on the mb owners forum. I'm 26 and from Northern Ireland.

I came here hoping to find a solution to an issue I'm having from some knowledgeable individuals!


The issue I'm having is with my 2009 C Class C180 (M271). It is an electrical issue and with any electrical issue take abit of explaining so I hope you can bare with me.


The issue arose first during normal journey, first on my dashboard “esp inoperable/cruise control inoperable” with the yellow explanation mark lit up (usually indicating Esp had been turned off)


On my next journey in the dark the issue became more serious.

The dashboard displayed the same messages, yellow indicator on, handbrake light, engine management, low fuel indicator, power steering. In short the whole dashboard lit up with a range of colours.

Window wipes would work intermittently, as would indicators and steering would become heavy at low speed. Speedometer, rev counter,and fuel gauge would also fail intermittently. After I got home and turned the car off the battery remained flat.


Next day there was just enough juice left to get it started and to an MB specialist located just a mile from me.


Upon arrival and the bonnet being open with the engine off we could hear clicks coming from what turned out to be the SAM and a more central location in the engine bay (mechanic said the ecu) one after the other.


Since this I have bought a replacement Sam unit which didn't appear to fix the problem. A month has passed since the car arrived at the garage.


The mechanic has suggested an ecu. He's hoping to get a hold of one to try it out first although this is proving to take a long time.


I'm wanting to know anyone thoughts on the possible issue, is it worth buying the ecu, do I need just an ecu or an ecu kit and what model number specifically?

Also there seems to be a great variation in prices. Does anyone know why?


I hope someone can be of help and thank you for taking the time to read about my problems.


Chris
 

LostKiwi

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Has the mechanic checked the earth point where it attaches to the body?
 
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C

Chris Finlay

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2009 W204 C Class C180 M271
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I will call in to him tomorrow and check that with him. I should mention everytime they plug this SAM in, fuses blow. Could this be a symptom of that?
Thanks
 

Westheath

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Empty garage, awaiting new toy :)
Which fuse blows ?

My concern would be with the low voltage and what's pulling it down.

Starter, Alternator might be short circuit.
 

Mujahid

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W204 C180K 2007 1.8
Hi there. Did you manage to fix this problem? I have a near identical problem to yours and the mechanic said that the ECU cannot communicate with the ABS, engine management and, gearbox module. He has suggested that the ECU could be the problem. Did you end up changing the ECU?

Car won't start at all, no cranking, just turns to ignition.
 

ajlsl600

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clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250

ajlsl600

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clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
Unlikely....
Suggests an issue with the SAM.
2nd that. Third world electrics/electronics .think I wud be giving any mb space shuttle a miss.
 


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