Have an 09 Fit Sport. None of the windows work. Stuck on up position. Ran direct wire from battery to front passenger, and both rear regulators. All 3 work. Connecting power and ground, they go down. Reverse polarity, windows go up. Didn't know how to do this test on the front driver side regulator. It has 6 pins. A bit more complicated. But I have a feeling that it also works. Checked the relay. It is good. All fuses are good. Traced all wires/harness from all regulators to the door switches, and from door switches to the master switch connector, and all wires from master switch connector to under the dash connectors and the fuse box. No broken wire. Bought 2 after market master switches (2009-2013 Honda Fit). Neither worked, including the car's original master switch. Have ground on pins 11 and 12, and power (12V) on pin 4 of the master switch connector. The door lock button works. Doors lock and unlock. On the schematic one of the pins of the relay goes to MICU. Does MICU have anything to do with it? Running out of ideas. Any suggestion? I'll be grateful.

 

Did the switches getwet at all recently?