Heater control panel
 

I would like to remove my heater control panel (the thing that controls the HVAC system position, blower speed, etc.) but I can't make sense of the harness. I would ideally like to have a multistage switch that I hook up the ground and it simply connects different pins to control the blower speed (I don't have any of the other things hooked up except the blower anyway).

The problem is I can't figure out how the blower is actually powered. I can easily switch what MODE the blower is in (hi, mid, low, off) but I can't get it to turn on. What do I have to connect to get the blower to actually turn on?

Thanks!