C70 2007 fog lights problem

[s402002]

Hello, i have visited garage to do simply job oil and pollen filter replacement. Guys have disconnected fuse box to get into pollen filter. After that i had a problem with my car as i guess connector wasnt fitted properly and dashboard shows several errors airbags etc and dash backlight worked randomly. When that happened my light switch backlight works odd like there is lack of connection somewhere. Now on i have a problem as my fog lights wont turn on at front and back as well! I have checked fuses every single one is ok including engine bay! I thought so light switch is faulty but its not as i have swapped with my friends s40 and switch works perfectly. Any ideas what to do?