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Discussion Starter #1
hi,

first let me say sorry for my poor english, i´m from germany.

i have trouble with my rear lights.
i get the error code that the light and brake light runs on "spare light" "ersatzlampe"
no led´s working, the light works with the rear fog light lamps.
i remove the rear lights and test it with a battery.
led´s are working.

error code in sam-r say there is a shortcut or cut to this lights.

the seller of the car says this error apperars when he changed rear lights back from black led´s to original lights.
i think maybe they harm the sam-r?
maybe they use the wrong rear lights?

can you help me witrh that, what can i test for fix this issue?

thx in advance.
 

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Just a dumb guess - maybe the PO (previous owner) forgot to remove all the wiring from the aftermarket kit?
 

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I looked at the wiring diagram for A USA R171 tail light, left side, it is confusing to me (so I probably will just confuse you - sorry). It shows the wire assignments as:


1) Brown - ground
2) Black/White (turn signal)

3) Green/White (fog lamp - LED)

4) Black/Red (side marker lamp - I am not sure what this means)

5) Grey/Black (stop lamp/tail lamp/parking lamp - LED)

6) Grey/Yellow (backup lamp)



Your picture shows the correct wire colors, but your large plastic connector looks like a wiring adapter attached (at the bottom of your picture). Can this adapter be removed? Mine does not seem to have this large plastic connector.
 

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Discussion Starter #4
I looked at the wiring diagram for A USA R171 tail light, left side, it is confusing to me (so I probably will just confuse you - sorry). It shows the wire assignments as:


1) Brown - ground
2) Black/White (turn signal)

3) Green/White (fog lamp - LED)

4) Black/Red (side marker lamp - I am not sure what this means)

5) Grey/Black (stop lamp/tail lamp/parking lamp - LED)

6) Grey/Yellow (backup lamp)



Your picture shows the correct wire colors, but your large plastic connector looks like a wiring adapter attached (at the bottom of your picture). Can this adapter be removed? Mine does not seem to have this large plastic connector.

the white?
this holds the lamps /bulbs
 

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Discussion Starter #6

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Like I say, not an expert.

Worth having a look at the wiring harness that is routed by the boot hinge.

It can wear and fray.
Mike wrote a good explanation.
Follow the link in the quote below for some detailed pics too.

We'll that was a cold day spent outside .. but pleased with the results.

First I found an old repair that had failed as they left the joint at the bend point of the wire!
So I then cut the old wiring back and made new joints protected with heat-shrink and new protective cover, pushing the joined wires up into the inside of the boot and then repeated half way down the lower strut (so the joint is protected by the plastic wire cover / protector).

I used a 7 core 'tow bar' cable plus a separate brown wire as that's twice the size of the others. also managed to feed the cable for the reversing camera through the protector at the same time so very happy with the repair :smile:

from
https://www.slkworld.com/general-discussion/255514-what-did-you-do-your-slk-today-336.html#post4470463
 

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All looks OK as far as I can tell from those pictures. Pin#4 on the tails is for the side-marker which is a small parking lamp that is only there on USA-spec cars. You can see from the pictures that the wire for this pin is missing, as is normal for ROW-spec. I don't see any aftermarket stuff in that picture.



Is it possible that there's something spliced into the car wiring further up the wire harness in the direction of the SAM?


Usually that message means that one of the important bulbs is out and the car has re-routed that function to a different light I think. The SLK is really good at making sure you have some kind of tail light illumination even when multiple bulbs burn out (like it will use the fog or backup lights instead of the normal LED strip if the SAM decides that the strip is not working).
 

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@Burnsi - apologies for my non-help. My tail lamps are different from yours - the white part of yours is black on mine, I didn't recognize what I was looking at.


Attached is a picture of the Rear SAM wiring in this area.
 

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Discussion Starter #16
In this wiring Diagram the fog lights are with led.
In my case the fog lights are bulbs.

Gesendet von meinem Mi MIX 2S mit Tapatalk
 

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In this wiring Diagram the fog lights are with led.
In my case the fog lights are bulbs.

Gesendet von meinem Mi MIX 2S mit Tapatalk
The stock fog lights on the R171 are definitely incandescent, not LED. That wiring diagram seems incorrect to me. I've been hunting all over my hard drive to find old captures I did of this part of the wiring diagram back in 2012 when I was doing modifications for after market tail lights, but all I could find was pictures I already edited to reflect the after market situation, not stock... I'll take a look at my service CD tonight to see what the wiring diagrams look like according to that thing.


From what you're describing in your original post, it sounds like the light units are working correctly, and it is the wiring from the SAM to the housings that is having an issue. Is the message coming on for both left and right-hand side of the car, or just one side? If it is just on one side, you could take the lights out and swap them between left and right (you can't mount them like that of course, but just put the housings in the trunk and wire them up that way). Actually I'm not sure how easy that will be because usually the wiring harnesses are exactly the right length so you may not be able to reach the light if it was in the trunk... Anyways, worth a shot.
 

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It wouldn't be the first time an MB diagram was wrong. I'm wondering if there is any relevant coding to help. I'm also somewhat perplexed how one circuit can control all three of stop, tail, and parking!
 

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WIS shows the same error in the diagram. My guess is they inadvertently used a wrong symbol for the fog lights and the pin numbering is still correct. According to the manual only tail/brake lights are leds.
If your lights are off braking will light up all the leds. If you switch your lights on only half of the leds for the taillight will light. If you brake the other leds will come on. I guess that's how it works.
https://drive.google.com/open?id=1d4uMQ3uOJ7QXWeRXXJexm99vvHSYnaKx


Maybe the cause of your error is that the PO connected the aftermarket lighs according the symbol in the diagram? I would check the wiring and take the numbering in WIS or the pic as a guide.
 
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