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Marty, I have a 2003 Mercedes S500 (w220), the following…

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Hello Marty, I have a 2003...
Hello Marty,
I have a 2003 Mercedes S500 (w220), the following items do not work when I start the vehicle: wipers, a/c, headlights, turn signal, trunk opener, power windows.
Submitted: 2 years ago.Category: Mercedes
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Answered in 3 minutes by:
3/5/2016
Mercedes Mechanic: rpmdiag, Tech and Instructor replied 2 years ago
rpmdiag
rpmdiag, Tech and Instructor
Category: Mercedes
Satisfied Customers: 8,864
Experience: Since 1975
Verified

Hi, I’m Ron and I can help you.
I have been in this business since 1975 and also teach automotive repair. I am confident
we can resolve your problem together. Please understand that I don't know your skill
level. I can't see, smell, hear, or touch the vehicle either, so it may take a few replies to
get to satisfactory results. Please be patient!
I also try to give all of the information you may need, expecting a “positive rating” in
return. I will also continue assisting you after you have rated me, if necessary. If there
is any reason I cannot get a positive rating, please let me know why “in advance”, so I
can go another direction for you. I am sorry you’re having this problem; I’ll help you
through it.

It's possible that you have a bad ground somewhere that is common to all those problems. Start with checking you battery cable ground first for tightness or corrosion.

Thanks,Ron

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Customer reply replied 2 years ago
Hello Ron, I already checked the battery cables, I also replaced the battery.
Customer reply replied 2 years ago
I also replaced all modules, generator, radio and ignition.
Mercedes Mechanic: rpmdiag, Tech and Instructor replied 2 years ago

You may have needed to program one or all of those modules to. I'm not at my database today to know for sure.

Thanks again, and please don't forget to rate me and keep this link in case you need me again later on. You should also check the computer grounds as well.

Ron

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Customer reply replied 2 years ago
The modules are from the same model car, same part numbers...etc. The modules are operating as intended, however the symptoms are still there.
Also the symptoms are not present when ignition is 2nd position, the symptoms come on only when the vehicle is started.
Mercedes Mechanic: rpmdiag, Tech and Instructor replied 2 years ago

Okay, then I would attach a scan tool and do bidirectional testing of the complete system to find where this error is coming from. This testing should reveal our problem.

Ron

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,013
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
Verified

Alec I am a Mercedes technician. First I need you to start the car and test every fuse in the driver side and passenger side engine bay fuse box also the fuse box on the passenger side of the dash and also the fuse box under the backseat test every fuse for power we are not only checking for a blown fuse but also for power to all the fuses let me know which fuses do not have power and I will compare that with a diagram, Lou P

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Customer reply replied 2 years ago
Lou, i did that, i went further and replaced all those fuse boxes/modules both under the hood and the one under rear seat.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

OK well you may have caught yourself more problems because the new modules have to be coded to the car

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

OK the issue you were having is an interior Can issue. Do you own a Mercedes scan tool ?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Do you know what the "can data bus " is?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

I also asked to check the fuses for power because there are certain relays that are active at certain key positions. I was not simply looking for a blown fuse.

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Customer reply replied 2 years ago
Gentlemen, lets schedule a time to resolve this issue on monday.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

I will be here when you need me. I will receive emails so no worries I will always respond back to you

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Alek are you still needing assistance?

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