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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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My name is ***** *****. My rear is faulty as a result of my

Customer Question

Customer: Hi, my name is ***** *****. My rear sam is faulty as a result of my s430 took in water from my drainage clogged. I confirmed that all the fuses on the sam are ok and it is getting power from the battery on the large wire.
JA: Thanks. Can you give me any more details about your issue?
Customer: My issue is that I replaced the module with a used one from a similar car model with a matching sam. the model number on the sam were different but I have researched that it was compatible with my car. The issue is that I installed the used module and it did not make any changes
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Submitted: 1 year ago.
Category: Mercedes
Expert:  Lou P. master tech replied 1 year ago.

Hello, so was of this point what does and does not work with your car?

Customer: replied 1 year ago.
hi, my rear indicators, fuel level, truck close, truck light and more features
the rear sam is faulty. I did some research on my error messages of "defective display" etc, and it leads me to the rear sam. I disassembled the sam and saw that the circuit board corroded and damaged.
Customer: replied 1 year ago.
I got a used module which I researched to be compatible with my vehicle, but it did not make a difference. I was told that the used module was already programmed
Customer: replied 1 year ago.
I confirmed that all the fuses on the modules were ok and have power on them
Customer: replied 1 year ago.
I dont know what I am missing. I am a trained mechanic but this issue is new for me.
Customer: replied 1 year ago.
r u there?
Expert:  Lou P. master tech replied 1 year ago.


Customer: replied 1 year ago.
Expert:  Lou P. master tech replied 1 year ago.

ok so you changed the sam and nothing still works correct?

Customer: replied 1 year ago.
right and I am seeing the same errors on my screen
Expert:  Lou P. master tech replied 1 year ago.

ok,. so have you had a scanner put on it to check codes?

Customer: replied 1 year ago.
I did and there were lots of codes even for other modules. I was thinking of clearing them and see what are current issues from old codes. but I didnt
Expert:  Lou P. master tech replied 1 year ago.

ok so first this is to document the codes, then clear them and see what returns, then we can trouble shoot

Customer: replied 1 year ago.
okay. gonna take about 10 - 20 min. I will do that and let you know.
Expert:  Lou P. master tech replied 1 year ago.

no problem, I am in no hurry, I will have to leave for a bit and I will check back later tonight so I will be gone between 3:30 and maybe 6 or so but I will still receive your message so feel free to send me whatever info you can get. and also what scan tool are you using?