My right light fog was disabled, it's OK, now.

[ricsim]

My right light fog was disabled.
Now it's OK.
I'havent found the solution in the forum, so i give you mine.
The problem was a broken welding in the lamp control box. (101 designed)


You can remake this welding to repare this spare part easily
You just need a screwdriver and soldering iron with tin

 

[500AMM]

Just adding another experience related to the fog lamps. The cable connector just outside the lamp are living in a harsh environment. Despite sitting behind the undercarriage plate they're exposed to water and chemicals, especially during winter driving. I found one of the tiny pins in the connector corroded away entirely! So, just a reminder in case the fog light start failing temporary or get a weak beam.

:idea:

 

[jnes]

My right light fog was disabled.
Now it's OK.
I'havent found the solution in the forum, so i give you mine.
The problem was a broken welding in the lamp control box. (101 designed)
View attachment 84793

You can remake this welding to repare this spare part easily
You just need a screwdriver and soldering iron with tin

Old thread but I have similar issue.. Did you have any other problems etc or just that?

I checked that I have no earth connection and neither +12 V to right foglight.

Other symptoms are that when turning headlights on or parking lights+foglights lamp failure indicator illuminates. I believe that this will link to fog light problem.

I will still check the control box for fault weldings.

 

[Jlaa]

Old thread but I have similar issue.. Did you have any other problems etc or just that?

I checked that I have no earth connection and neither +12 V to right foglight.

Other symptoms are that when turning headlights on or parking lights+foglights lamp failure indicator illuminates. I believe that this will link to fog light problem.

I will still check the control box for fault weldings.

I have had intermittent right front foglight issues myself. When I switched my bulb out warning relay, my right front foglight resumed normal operation.

If you wish to open up your BoW to check the solder points in the BoW relay, here are the pinouts Pin 8 under Group X3 is the pin for the right front foglight.




This is from this thread: HOW-TO: Prevent 3rd brake light (CHMSL) from melting by using a European-spec N7 Bulb Out Warning Relay and an LED | "HOW-TO" Tutorial Articles

 

[jnes]

That bulb warning relay is that part 101 ? A1265420332 ?

 

[Jlaa]

That bulb warning relay is that part 101 ? A1265420332 ?

US cars used 126.542.01.32
Non US cars used 126.542.03.32

In my experience there were several suppliers of 126.542.03.32, including Hella and Stribel, all with the same Mercedes part number. I have observed the Stribel version to be more modern in design and perhaps more reliable than the Hella unit. (2 layer SMD PCB vs. through-hole old-school PCB)

 

[jnes]

I measured the wires, they were ok. Opened the relay and same welding was cracked. Need to weld it again and then test if it works. My relay is made by Hella

 

[jnes]

I sourced new relay and installed it and lights work fine. I'm about to fix cracked weldings.