QuestionOn my 94 Ford Van the drivers side window will not work nor will the passenger window work with the drivers door switch. The pass side works with the pass door switch.
The drivers door has a double switch. It has power to one wire and a good ground wire. With the ing switch on if I move the window switch up or down it powers a different wire.
AnswerHi Jim,
My best guess is that you have a bad motor in your driver door and a wiring or switch issue related to your passenger door. I don't have a wiring diagram available for this vehicle, but I think I can give you enough information so that you can diagnose your problem.
The two button switch on your driver's door should have six wires. I believe the blue wire is power into the switch and the black wire is the ground. The other four wires control the two windows: an up wire and a down wire for the driver window and an up wire and a down wire for the passenger window. I don't know which color wire is which, but it should be easy to determine by using your test light (electrical meter) as follows: (This assumes a good switch.)
1. While pressing the driver window button down, touch all four remaining (not black or blue) wires with your test light to see which one lights up. Call this wire A.
2. While pressing the driver window button up, touch the remaining three wires with your test light to see which one lights up. Call this wire B.
3. The remaining two "unlit" wires control the passenger window, if the switch is working properly, one of the two should light up when you press the switch down and the other should light up when you press the switch up. Call these wires C and D.
If all four wires light up, go to step 4. If that doesn't happen go to step 6.
4. (NORMAL SWITCH OPERATION)
Since you have power out of the switch on driver wires A and B it is likely that your motor is bad. Pull the wire connector off the motor. Use your test light to confirm that you are getting power to both sides of the wire connector when you operate the switch. If you have power at the connector and the motor won't, run you have a bad driver motor.
5. Since you have power out of the switch on passenger wires C and D, you may have a broken wire between the switch and the passenger window. To confirm the wiring integrity, go to the PASSENGER SWITCH and check for power on the same color wires coming into the PASSENGER SWITCH as was noted on wires C and D at the driver switch. If you don't get power at the passenger switch it is likely you have a broken wire.
6. (SWITCH MALFUNCTION) Remove the driver switch from the wiring connector. Use a 12 volt power source such as an extra battery or just run two wires from the truck's battery. Touch the two wires from the battery to driver wires A and B, then reverse the connections. If your switch is the problem and your motor is good, the driver window should be going up and down. Now repeat the same process using passenger wires C and D. If you get normal operation using this technique, you have a swith problem
Good luck with your project. Feel free to send me a follow up question.
Ben .... the power window guy.
