Wiper motor -- how to make it stop at the bottom

[240hoke]

Hey,

 

Ive tried doing the honda wiper motor swap but the motor that i got off ebay turned out to be bad from what I can gather. I tried hooking it up like hte faq says and it was a no go. I tried just about everything.

 

Soooo Im back to a cleaned up 260z wiper motor I had laying around. Runs great has high and slow speed but cant figure out how to make it stop at the bottom.

 

My question is -- is where it stopps after the switch is turned off controlled by the motor, or circuits in the car? I have three wires running off my combo switch. (I have converted to painless) so the only thing i have is the wires off the combo.

 

I was hoping somebody with some electrical knowledge could help me out.

 

Thanks