Cant figure out blinker problem

[havardbo]

Hey i got a weird issue with my right-back blinker on my 07 volvo xc90. When the right turn signals are on it blinks really fast and only the front and mirror blinker work, the rear blinker dosent work, so i changed the bulb and it is still not working correctly. I guess i need a new blinker realy or something, but I dont really know. Doess anybody know how to fix this?

All help is appreciated, thanks!