Tail light and front city light does't work

Fuse and lamps are fine. The only thing that work is high and low beam, and the stop light when the brake is pressed.
What else i can check?

I noticed on my bike (different model/year) there is a small diode coming off the rear light. It was missing and the wires just hung loose. Once I connected the 2 wires everything worked on the tail/brake light. Problem is,the diode is taped into the main loom (or should be) you have to fish around to find it.
Like I said,different model/year to yours so maybe it dosnt apply. Check your wiring diagram and see whats what.

Thank you veru much. I have never seen this diode, i have to look near the tail lamp?
I have the manuale but i miss the wirings pages. Can someone post a pic of the wiring for the KZ 550 h? Gpz.
I was thinking about the switch in the handlebar but i noticed that the position light doesnt work neither with the key in parking position. So i guess the switch is good . is this assumption right?

Solved. Just the blue/red wire in the key switch connector broken. Fixed!