Rear window wiper not working (estate/wagon)

[johna]

I have a 2000 C200T here in Australia.

Since I bought it recently the rear window wiper and washer do not work at all.

Pressing the switch in either position does nothing.

No light comes on.

I removed the trim on the rear door and can see the motor and checked the relay. I couldn't find any voltage to the relay. I also checked all fuses.

Is there any suggestions on how to fix this or does anyone have a wiring diagram for this part of the car?

Edit: the interior light is also stuck on all the time. Could this be related?