good night brother the glass elevator system of the main command (pilot door) works in series with the other swich if you disconnect a swich of course it will not raise or lower the glass you did not specify what van is but I can help you you have to have a current tester you must first disassemble the doors and identify the two cables that go to the motor, the other two cables are the inverters that come from the main control, just jumper the motor cable with the inverter cable of the control in each cable if you have inverted that When you go down, go up and vice versa, just invert the cables. Note, if you replace the swich, you must remove the jumpers first. I hope it helps you