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Gremlin of the day- intermittent lamp malfunction, but it works fine, W209

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Old Nov 17, 2024 | 12:30 PM
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2003 CLK 320 Cabriolet (W209)
Gremlin of the day- intermittent lamp malfunction, but it works fine, W209

So I have been getting an intermittent malfunction- "License plate lamp, right" but when I get out of the car and look at it it is lit up just fine, same as the left.

Should I change the bulb anyway, or is that a waste of time? Any thoughts on what it could be?

Thank you,

Sixcarbs

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Old Nov 19, 2024 | 02:43 PM
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W212 MY'14 M276-3.5NA @75kMi
Working bulbs... faulted by SAM !

That is a strange combination you got!

Is this harness flexing during trunk opening by any chance??

The Rear-SAM module poor connections may be acting up.

Can you reproduce fault using your scanner test functions?

Last edited by CaliBenzDriver; Nov 19, 2024 at 02:48 PM.
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Old Nov 19, 2024 | 02:48 PM
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Originally Posted by CaliBenzDriver
Is this harness flexing during trunk opening by any chance??

The Rear-SAM module may be suffering from its poor connections.

Can you reproduce fault using your scanner test functions?
I rarely open the trunk. I will need to see if I can find the harness. The whole Rear SAM was recently redone. I don't have a scanner.

I was going to take the bulb out and clean the ends and connections.

It's just strange because it pops up, I get out and check and the light is perfectly illuminated. And then sometimes it does not show any malfunctions.

Thank you, I will poke around there tomorrow in the light of day.
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Old Nov 19, 2024 | 02:52 PM
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prior related repair....

Originally Posted by Sixcarbs
I rarely open the trunk. I will need to see if I can find the harness. The whole Rear SAM was recently redone. I don't have a scanner.

I was going to take the bulb out and clean the ends and connections.

It's just strange because it pops up, I get out and check and the light is perfectly illuminated. And then sometimes it does not show any malfunctions.

Thank you, I will poke around there tomorrow in the light of day.
Why was your "Rear-SAM redone" ?

SAM replaced with a different unit... used/new?

This current issue is likely the aftermath of that earlier battle.
Let's understand what happened BEFORE to plan what to do AFTER...
✌️

Don't tinker with the bulbs just now or shop will say YOU messed them up... for an extra $500 billing
​​​​​​


Last edited by CaliBenzDriver; Nov 19, 2024 at 02:57 PM.
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Old Nov 19, 2024 | 02:57 PM
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Originally Posted by CaliBenzDriver
Why was your "Rear-SAM redone" ?

SAM replaced with a different unit... used/new?

This current issue is likely the aftermath of that earlier battle.
Let's understand what happened BEFORE to plan what to do AFTER...
✌️


​​​​​​
Not really sure of the details. All I know is it seemed like all of my problems went away after they repaired the front and rear SAM, plus some other wires I talked about it here:

https://mbworld.org/forums/mercedes-...-320-w209.html

I guess I should pay them a visit again.
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Old Nov 19, 2024 | 03:04 PM
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Originally Posted by Sixcarbs
Not really sure of the details. All I know is it seemed like all of my problems went away after they repaired the front and rear SAM, plus some other wires I talked about it here:

https://mbworld.org/forums/mercedes-...-320-w209.html

I guess I should pay them a visit again.
that is directly a YES to that
Let them finish their fine surgery job.

This can be caused by a "simple" programming issue and take north of 4 hours to locate the correct config file...
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Old Nov 30, 2024 | 05:57 AM
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Originally Posted by CaliBenzDriver
that is directly a YES to that
Let them finish their fine surgery job.

This can be caused by a "simple" programming issue and take north of 4 hours to locate the correct config file...
Well, I have been too busy to get back to that electronics place. The intermittent malfunction error continued along with the lamp working just fine. Until a few days ago when I then noticed the light was out.

It turns out the computer is smarter than we thought and was trying to warn me about a sick light, soon to die. I changed it this morning. The old one below is clearly toast.


Burned out bulb up top, new one from Mercedes dealer in plastic below.



Last edited by Sixcarbs; Nov 30, 2024 at 05:58 AM.
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