Power Window Function Test
- Turn ignition on. Check operation of all window switches. If both windows are not working, go to step 2). If only driver's window is not working, go to step 5). If only passenger's window is not working, go to step 7).
- Check power window fuse. Replace fuse if bad. If fuse continues to blow, check for shorts to ground in Black/Red wire at window switch connector. If fuse is good, go to step 3).
- Check for 12 volts on Black/Red wire at driver's window switch. See Fig 1
. If 12 volts is present, go to step 4). If no voltage is present, repair Black/Red wire between fuse panel and driver's window switch.
- Turn ignition off. Check for continuity between ground and Black wire at driver's window switch. If continuity exists, replace window switch. If no continuity exists, repair Black wire between window switch and ground.
- Disconnect driver's window motor. Apply battery voltage and ground directly to motor for 2 seconds. Reverse polarity for 2 seconds. Reverse polarity again for 2 seconds. If motor operates in both directions, go to step 6). If motor does not operate in both directions, replace motor.
- Check continuity in both Green/Blue and Red/Blue wires between the driver's window switch and passenger's window switch. See Fig 1
. If no continuity exists in Green/Blue wire, repair Green/Blue wire between driver's window switch and driver's window motor. If no continuity exists in Red/Blue wire, repair Red/Blue wire between driver's switch and driver's window motor. If continuity exists in both Green/Blue and Red/Blue wires, replace driver's window switch.
- Disconnect driver's window switch. Apply battery voltage to Green/White wire and ground to Red/White wire of passenger's window switch for 2 seconds. Reverse polarity for 2 seconds. Reverse polarity again for 2 seconds. If motor runs in both directions, go to step 10). If motor does not run in both directions, go to step 8).
- Disconnect passenger's window motor. Apply battery voltage and ground to motor for 2 seconds. Reverse polarity for 2 seconds. Reverse polarity again for 2 seconds. If motor runs in both directions, go to step 9). If motor does not run in both directions, replace passenger's window motor.
- Check for continuity in both Green and Red wires between passenger's window switch and passenger's window motor. If no continuity exists in Green wire, repair Green wire between passenger's window switch and passenger's window motor. If no continuity exists in Red wire, repair Red wire between passenger's window switch and passenger's window motor. If continuity exists in both Green and Red wires, replace passenger's window switch.
- Check continuity in both Green/White and Red/White wires between driver's window switch and passenger's window switch. If no continuity exists in Green/White wire, repair Green/White wire between window switches. If no continuity exists in Red/White wire, repair Red/White wire between power switches. If continuity exists in both Green/White and Red/White wires, go to step 11).
- Check for battery voltage on Black/Blue wire at passenger's window switch. If battery voltage is present, replace passenger's window switch. If no battery voltage is present, go to step 12).
- Check for battery voltage on Black/Blue wire at driver's window switch. If battery voltage is present, repair Black/Blue wire between passenger's window switch and driver's window switch. If battery voltage is not present, replace driver's window switch.
Courtesy of FORD MOTOR CO.