Rear tail light issue

[Neils65]

I have a 2012 c220 coupe AMG sport diesel and the off side rear tail light is out. The bottom one is good and the near side are both good. Both sides are LED and I can’t find the fuse for it, the handbook is very vague. The sidelight indicator on the dash also doesn’t work but the dipped and high beam work fine. Any help or advice would be greatly welcomed.

 

[DSM10000]

Welcome to the Forum.

There probably isn't a fuse as such.

The lights are usually controlled by a Signal Aquisition Module (SAM) either in the front or rear of the car

Find a local MB specialist with Star (MB diagnostic computer) who can scan for faults.

 

[Neils65]

Welcome to the Forum.

There probably isn't a fuse as such.

The lights are usually controlled by a Signal Aquisition Module (SAM) either in the front or rear of the car

Find a local MB specialist with Star (MB diagnostic computer) who can scan for faults.

Many thanks, very much appreciated

 

[Uky]

Many electrical problems are in fact mechanical. Bad connections caused by corrosion, moisture ingress or misaligned contact elements inside the connectors.
Before taking the car to an MB Specialist, I would try to rule out any such problem.

 

[Chrishazle]

Rear lights on the C class are well known to fault due to the earth connection from the back of the light cluster being too thin and burning out. IIRC it's a brown wire, so check that first and replace with a heavier gauge wire if it shows signs of burning.

 

[AMGeed]

Rear lights on the C class are well known to fault due to the earth connection from the back of the light cluster being too thin and burning out. IIRC it's a brown wire, so check that first and replace with a heavier gauge wire if it shows signs of burning.

Exactly the job I did a few weeks ago.
It has cured the failing rear light message I used to get regularly.

 

[Neils65]

Thanks guys, I have checked for scorched/charred wiring and there is no evidence thankfully, I will however, give the connections a good scrub before taking it to get tested. Strangely enough, there is no warning message on the dash…

 

[AMGeed]

Thanks guys, I have checked for scorched/charred wiring and there is no evidence thankfully, I will however, give the connections a good scrub before taking it to get tested. Strangely enough, there is no warning message on the dash…

If you do add an earth wire, its very easy to do.
This video shows how. I drilled my light unit and bolted the earth wire to that, and then to the bodywork in the wheel arch.

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[Neils65]

Great thank you

 

[scottym67]

This weekend I just repaired two broken wires to a rear light cluster in my 2018 E220.