I hope you got the connector with the motor, and some of the wiring.

If you've got a car battery handy, then if the motor is the same as a sierra rear wiper motor (which it probably is) try the following :

1. connect the brown wire to earth
2. connect the black/purple wire (wiper motor terminal number 53A) to +12V to replicate the ignition-switched feed to the motor
3. connect the black wire (wiper motor terminal number 53) to +12V to replicate the column stalk, so just for a few seconds.

This should get the motor going, and if so it should self park a few seconds after you've removed the black from the positive battery terminal. (From the Haynes manual, it looks like the self park is self contained within the motor.)

If the above works, then you (ie me) can have a think about connecting it up to your stalk.

Are you sure it's a rear wiper motor you need, as this'll only give you single speed wipers ?