I found a broken wire in the wire bundle that goes from the drivers door to the body of the car. Its covered by a rubber boot.
I would check the switches first then check the window motor for passengers side.
power window moter is bad.
Does this car have a safety lockout of the passenger switches? It's probably activated. If it was just one passenger window I would suspect a broken wire, most likely in the rubber bellows between the door and frame.
You will need to remove the inside door panel in your 1989 Ford Mustang. Remove the window retaining clips. The window will lift out. Reverse the process to install the new window.
push down on the button at the rear of the door where the window meets.
There is only one fuse for all power windows. If only the passenger side window does not work, the problem is either with the passenger window switch or the motor on that window.
define the problem is door switch and not window motor.
You need to identify the problem before you can carry out any repair.
If you can operate the window from the driver's side, then you need to replace the switch on the passenger's side. If neither side works you need to replace both switches. You buy the switches at any auto parts store. They are fairly cheap. The cover on the window-control panel can be easily removed. If there are no screws, just pry it up.
First determine the problem Remove door panel to see if power is getting to motor--if so motor is bad--if not could be switches or wiring to same
It could be the switch,power source to the switch, or the motor is burnt up. More than likely the motor is the problem since the driver side get a great deal more use than any other.
I would replace the master window switch