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Good day everyone!
I recently bought a facelift kit from the dealership with all OE parts and I'm DYI-ing the installation.
Specifically, now that I put the rear bumper on after I took it from the Bodyshop I installed the 4 pcs tail lights (2 in the fender and 2 in the trunk).
I have found that the outer lights are plug-and-play but the inner rear position lights did not light up with the fog lights although the reverse light was working and there were errors in the instrument cluster.
I took the assemblies to my bench and will share with you what you need to know to get them running by swapping wires, but I didn't bother to remove the errors which I think are resistance-based or SAMR.
Where the old inner assembly had break lights working simultaneously with the outer lights the new inner assembly doesn't.
To make the facelift tail lights work you will need to change the wiring.
The old assembly wiring was
Common (negative)
Fog light
Reverse light
Break light
Rear position light
Null (empty/blank)
the new assembly wiring was
Common
Rear position light
Reverse light
Fog light
Null (empty/blank)
Null (empty/blank)
You will need to change the wiring by slightly ejecting the tap holding the contacts (you can see the picture at the end of the post on how it has to end up) and changing the order of the wires to adapt to the old ones. (It is numbered on the connector but the wires are all white with no marking so DO NOT mess up and use markings or masking tape with the numbers so you don't forget)
The new assembly wiring reorder
Common
Fog
Reverse
Null (empty/blank)
Rear position light
Null (empty/blank)
If anyone knows a fix for the instrument cluster errors please reply to this thread and share it!
I know this isn't an exact tutorial but tbh I am not a professional electrician.
Hopefully, this will help someone who doesn't want aftermarket quality and bought the assemblies from the dealership or OEM.
If anyone knows a fix for the instrument cluster errors please reply to this thread and share it!
.
Its software based and very much likely you need professional coding service for rear SAM.
To loose the capability of rear SAM telling you that X Y Z bulbs are blown out is kinda risky.
I kinda understand, but I don't have any equipment or know of any shops local to me that even remotely know how to perform SAMR coding.
Basically, I am more interested in how to fool the SAMR module into thinking your tail lights are working without resorting to reprogramming the module.
For now, I am going to try to get the resistance right and see if resistors inline with the wires can fool it or if there is more to the story as I tbh not an automotive electrician, so I will try to modify the hardware, and share the solution without risk.
I am out of country till mid JAN 2023. So no access to WIS wiring in my main PC at home.
I am wondering too what are the difference rear SAM wise for before facelift to facelift one, if any for its wiring to tail light assy.
Based on my experience doing T10 LED bulb conversion, oddly enough it is not purely amperage based sensing for trunk light and in-cabin ones.
Something more complicated is the blown or incompatible bulb sensing method by some modules. https://mbworld.org/forums/e-class-w...y-you-say.html
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2009-2013 W212 OE Factory Tail lights facelift conversion rewiring toturial
