im new on this forum and ive looked around on it and havent found the particular problem that this 2004 infiniti g35 coupe is having.
First off this isnt my car im looking to buy one and i saw there was this problem while looking at the car so the problem is that the driver side window switch will not control the passenger side window to make it go up and down but it can be controlled from the passenger side switch. If any one has had this problem or has found a thread with this problem it would be greatly appreciated if you can help in any way with this problem and i do realize that this shouldnt be a dealbreaker for the car. thanks

 

So the passenger window goes up and down with the passenger switch, so the gears are good, the motor is good, and the wiring is good,
that really can only mean, that your Drivers Side Window Switch is no good, it can still operate one side but be out in the other side,
Drivers Side Window Switch - 25401-AM620 - $258 shipped

 

You might be able to get away with taking the switch apart and cleaning the contacts on the window switch.

 

^+11111111111111111 there's always that ;0)