Use a fused jumper wire to bypass the switch and route power directly to the motor. If the window now moves, the problem is a bad switch. Replace the switch. If the motor does nothing, the problem is a bad motor. Replace the power window motor. ...
Some of the more common options for connecting the remote turn on wire when using a factory head unit are to the wire connected to a power antenna (older vehicles which do not turn off the antenna when not using the radio) or to the vehicle's fuse box. Since the remote turn on wire ...
I opted to not use the micro-USB port to supply power to the Pi, and instead soldered some header pins to TP1 and TP2 to provide +5V and GND respectively. This avoided having to cut/splice a USB cable and made for cleaner wiring. The header pins came with some jumper leads I bought...