Vansco inputs/outputs are likely very close to the Limited coach I/O. There are a couple of documents on the ACA Tech Library
under Chassis & Brakes for Vansco circuits. Check those out.
Also, the front shades are powered on the Ltd & SE coaches thru some low amp fuses located below the dash and by the driver's right knee. On mine you pull off a plastic plate held on w/velcro to access the fuses. If you have none there, I suspect the firewall has a fuse block w/those circuits. One each 3A fuse per shade on mine IIRC.