I have a 2005 Mazda 3 S (5Door).

Had issues with power windows on and off. Didnt work sometimes, then worked again.

But now for 3 month BOTH drivers side windows dont work. Front and Back from either switch. I bought a new master switch of Ebay and nothing changes. Both windows dont work. The switch for the front drivers side window lights up (red) but thats it. I guess the problem is wiring?

Help anyone know what it could be and where to start looking?

 

if you have a volt meter you can make sure that voltage is getting to the switch, there could be a smoked fuse - easy fix.

The stock system has that lockout button on the drivers switch that is a single contact for all the grounds (pretty sure it's the ground side) for all the windows (except the driver), but that one connection to the chassis ground could be corroded or something. If the door has been used a lot, the wires could be breaking apart where the door swings open, so see if it works any different with the door open / closed / moving.

The system is fairly simple, all the motor connections are tied to ground, and when you hit a switch it disconnects one motor wire from ground, and connects it to battery. Depending on which side of the motor goes to battery dictates the motor direction.