Rear Wiper motor not working

[TGR59]

Hi,
We are brand new to Yaris World so hello everyone. We have a problem with our 09 Yaris as the rear wiper motor is dead.
Looking through the manual and on line we see that fuse number 28 in the fuse box behind/under the glove box controls the rear wiper/washer.
The washer works but the motor doesn't.
The slot for fuse 28 was empty so I put a spare 15amp fuse in. Still no motor.
If the washer works - surely the motor should work? Does this suggest the motor has died?
If so - can someone tell me how the heck I get the plastic panelling off of the rear (hatch) door so I can get at the motor to check there is power to it and eventually (if necessary) change it?
Thanks in Advance
Cheers
Larry