Hi there, 

 

as you know superb has 2 backup lights , i have problem because the left one does not work and the right one works perfectly. I disconnected the wiring from left side and everything seems good. Also I disasembled trunk part to check wiring , no broken or loose wiriing also. My electrician told me that left and right side use same power and I am reallly confused why it does not work. Is there any way to pull out wiring from this part ( check photo) and to check 2 other wires?  I know there is wire missing here but I fixed that !

P.s. fog light works on left side perfectly. Only backup light does not!

It was fameous twindoor wiring issue. Fixed.