Hi,

My 2004 S80 backup light is not working, but the fuse is definitely good. I also can measure 12v from backup fuse, definitely it's not bulb problem, because both of backup light is not working. any clue? thank you.

 

I measure the voltage from back up light and didn't see 12V number, look like it is disconnected from power, is this caused by relay? if it is caused by relay and then where this relay? thanks.