I don't have the wiring diagram for your model, but a wiper circuit is basically: battery (via ignition switch) -> fuse -> dual-speed switch -> dual-speed motor - > earth.
So, if battery and fuse are okay, then that leaves switch, motor and earth to check.
If I were a betting man, I'd back bad earth or bad switch before bad motor.
In order to do some continuity checking, you need to work out which wire is which on the motor.
I'd use an ohm meter to check that that the motor is getting a good earth. If so, then I'd next use a volt meter to check the switch by seeing if the motor is getting 12 volts in each position.
(Alternatively, some wiper systems have battery on the motor and the motor gets earth via the wiper switch. Again, I don't know which way your model is wired.)
If the switch checks out okay, then it sounds like the motor, and it could be its wiper-park contacts (... or something else). However, before shelling out for a new wiper motor I'd get it checked by an experienced autosparky.