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2013 C250 SAM/CAN Bus issue?

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Old Oct 8, 2021 | 08:07 AM
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2013 c250
2013 C250 SAM/CAN Bus issue?

Greetings all, new to the forums here but seeking some help on an issue I’m having. Time to time high beam lights engage, clutch fan rpm’s up, wont start if the issue’s already going on before entering the car, adaptive highbeams, ambient air, temperature, dash lights, all function incorrectly. Stomping on the drivers side floorboard temporarily stops the issue. I’m not too advanced in mechanics but have some fair experience and not even close to financially stable enough to go pay 160$/hr at the dealer. I’ve narrowed it down to either a SAM module issue (don’t think this is the problem) or a CAN Bus issue (due to location/temporary fix).
I don’t know where to begin as far as testing. I can tear into the floor boards and expose it all, have a multimeter, but wondering what I should look out for.
thanks in advanced, and will keep you updated. See attached video for current “fix” lol.
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Old Oct 9, 2021 | 12:23 PM
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Originally Posted by oJamesCo
Stomping on the drivers side floorboard temporarily stops the issue. … I’ve narrowed it down to either a SAM module issue (don’t think this is the problem) or a CAN Bus issue (due to location/temporary fix).
That observation may be a strong indicator but not specifically diagnostic. The root cause of intermittent electrical problems can be very difficult to pinpoint.
Assuming that you would follow Plutoe’s recommendation 2 and keep driving the car, have you considered an indie mechanic in your area who specializes in German cars? They often work at about ½ the rate of the dealers.
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Old Oct 10, 2021 | 03:33 PM
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@oJamesCo Take the car to your local auto parts store and scan for codes. Report back here with the codes.

When did you last change the battery?
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Old Oct 14, 2021 | 03:52 AM
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Stomping fix...

Originally Posted by oJamesCo
Greetings all, new to the forums here but seeking some help on an issue I’m having. Time to time high beam lights engage, clutch fan rpm’s up, wont start if the issue’s already going on before entering the car, adaptive highbeams, ambient air, temperature, dash lights, all function incorrectly.

Stomping on the drivers side floorboard temporarily stops the issue. I’m not too advanced in mechanics but have some fair experience and not even close to financially stable enough to go pay 160$/hr at the dealer. I’ve narrowed it down to either a SAM module issue (don’t think this is the problem) or a CAN Bus issue (due to location/temporary fix).

I don’t know where to begin as far as testing. I can tear into the floor boards and expose it all, have a multimeter, but wondering what I should look out for.
thanks in advanced, and will keep you updated. See attached video for current “fix” lol.
You've got luck! Your stomping test narrows it down greatly in your favor.

Nothing major, it's either water intrusion or a funky ground screw in the "driver footwell" area causing your F-SAAAM to act up.
Can you see any sign of past water in SAM enclosure ie. corrosion??
​​​​​​
A good SCAN will help you figure what's getting disrupted.

Do you have schematic and related skills?? This will help you corner your​​​​ issue.
✌️

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