DRL not working

[Roger3man]

Good afternoon.
2015 W205 coupe
I have come to a blank. Drivers side DRL is not working, changed the balast but no joy, checked all known fuse locations but all seems good, any advice on next steps? I know there are many links but not one that I can find an answer to.
Many thanks

 

[markjay]

Welcome.

Is it a C205 or C204 (2015 can be either)?

 

[Roger3man]

Welcome.

Is it a C205 or C204 (2015 can be either)?

Definitely a 205

 

[Roger3man]

Definitely a 205

Update, bumper off, both control modules swapped and I only one works, 2 new ones ordered ready to repeat the process next weekend