You don't list what year LS you have. Since the window operates as intended from the driver's switch & key fob then that tells you that the problem lies in the wiring or the switch on the passengers side. Don't worry about the driver's master switch lock-out it only locks out the rear windows not the front passengers window. If you have an 00-02, pop up the window switch trim and see if the wiring connector is still plugged into the switch, if so then check to see if there is 12V at the #3 terminal (yellow with violet wire) with the key turned to the accy position. If you have 12V on #3 terminal then check to see if you have 12V on terminal #2 (gray/white wire) when you press the switch in the down position, if not the switch is bad. If you don't have 12V at #3 terminal, check to make sure the rear window are working from the rear switches. If the rear windows work from the rear switches then the 12V power signal has been disrupted from S409 to the front pass switch. If the rear windows don't work from the rear switches then connector #420b terminal #5 (yellow wire) at the REM(rear electronic module) needs to be checked for 12V.
