10/50 is the left rear brake bulb. It goes from the CEM to the brake bulbs.
10/19 is the 3rd brake light, LED. Not sure why the PBM would have affected the brake bulb.
Look at bulb socket #4 contact points for any arcing on the socket contacts and where the bulb socket contacts, contact the lamp body contacts for any arcing. Replace bulb socket #4 if needed. You may end up replacing the lamp body if the contacts can not be cleaned. Try dielectric grease on the contacts.

 

Thank you so much for the diagram! So basically, left and right stop lights are on two different circuits from CEM. Then assuming it's not the wiring, not the socket, not the bulb, then knock on wood it isn't the CEM.
I'm curious if the database indicates where the CEM is and which plug/terminal to probe (C2.59?)
BTW what do you use to look this up?

Thanks

 

Go here to download the wiring diagram and possibly Volvo VIDA.
Volvo VIDA is the stand-alone version that you can look up parts, repairs, specs ect.
The CEM location and connector numbers are a screen shot from the wiring diagram.
I would lean towards a dirty connection and not a failing 4/56, CEM.
Volvo Diagnostics – Virtual Machines, Installers and More

 

Good day
Any luck on the matter? I have a XC60 2012 D4 and my right rear stop light is off with message of stop bulb error. It’s not the bulb and not the fuse. I cleaned the last wiring connector that leads to the bulbs with no luck.
Any suggestions?
Thank you in advance

 

Thank you again volvogod. Workload got in the way but I do have some dielectric grease somewhere, that'll be the easy thing to try. I may also have to devote some time to play around with the vm image (seeing that the online EWD sometimes says something about 'Context Root Not Found').

Zuperman good luck with yours as well. I'll let you know if I find anything, and please let me know if you do, too.

 

Well it did turn out to be a bad connection somewhere close by the bulb socket. Since I didn't have a helper, one thing I did differently was I used an umbrella to keep the brake pedal depressed (to keep the brake light activated) while jiggling the socket and wires (previously - jiggle weires, then depress brake to check against illumination). Still need a permanent fix, but at least the problem got narrowed down. Space is kinda tight to work on the tailight wiring, so am not looking forward to it.

Thanks again volvogod for your assistance.

 

Good day,

Finally i reset the malfunction buy using a Car Scanner Pro app on my phone via OBD2.
All stop lights working.

Thank you all