All Power Windows Inoperative
- Check Power Supply And Ground
- Remove master window switch. See MASTER POWER WINDOW SWITCH
under REMOVAL & INSTALLATION. Turn ignition on. Using voltmeter, measure voltage at connector "B", between terminals No. 2 and 3 of switch connector. See Fig 1
. If reading is 10 volts or less, go to next step. If reading is more than 10 volts, go to step 7).
- Check Ground Continuity
- Turn ignition off. Disconnect negative battery cable. Using ohmmeter, measure resistance at connector "B", between terminal No. 3 and known-good ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open Black wire.
- Check Switch Power Supply
- Reconnect negative battery cable. Turn ignition on. Using voltmeter, measure voltage at connector "B", between terminal No. 2 and known-good ground. If reading is 10 volts or less, go to next step. If reading is more than 10 volts, go to step 7).
- Check Power Supply Fuse
- Check for voltage at both sides of fuse No. 21 (40 amp), located in interior fuse box. If no voltage exists at either side of fuse, go to next step. If voltage exists at both sides, turn ignition off and go to step 6).
- Test For Short To Ground
- Disconnect negative battery cable. Remove fuse No. 21. Using ohmmeter, measure resistance at connector "B", between terminal No. 2 and known-good ground. If resistance is 10 k/ohms or more, go to next step. If resistance is less than 10 k/ohms, repair Purple/Blue wire for short to ground.
- Check Power Supply For Open
- With fuse No. 21 removed, measure resistance between output side of fuse cavity and connector "B", terminal No. 2. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Purple/Blue wire.
- Check Window Switch Operation
- Test power window switch. See POWER WINDOW SWITCH
under COMPONENT TESTING. Replace switch if it does not test as specified. If switch tests okay, system is operational at this time.
Courtesy of FORD MOTOR CO.