I found that thereís not much to the wiper motor. Below are pictures from when I pulled mine apart.
There is a total of 5 wires. Two go to the motor itself for low and hi speed. The other three go to the head of the motor where the park feature is controlled. You will see that the three wires have contacts on the underside of the cover which touch a disk (see other picture). You can see the three circles on the inner portion of the disk where the contacts make contact. It looks like the disk is design such that the inner and outer contacts loose continuity with the center one when the disk is in a specific position. This is what makes the park feature work.
You can also see in upper potion of the picture that the gasket wasnít installed correctly which potentially let water leak into the motor.
I realize you have already ordered a replacement motor, but I suspect it make take some time to get. My order of a pivot shaft and wiper arms took 2 months as the parts were coming from China and the ship was parked on the west coast waiting to be offloaded.
For my motor, the problem was that the contacts where not touch good enough. I bent them slightly to add some tension to them and also lightly sanded the ball on the end of the contacts. Unfortunately, one of the balls fell off. The motor still worked without the ball, but I opted to reassemble it correctly. The folks at Wiper Technologies was nice enough to send me an old motor cover which I replaced on my motor and all is good. Iíve used the wipers a few times during my 1K mile drive to SWFL a few weeks ago.
I also a have a document for testing the motor. Basically you provide power and/or jump various pins on the connector to test the motor at low and high speeds as well as the park feature. If you are going to attempt to fix the motor, I can send you the document to assist.