LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Ford >> 2000 >> Expedition 4.6 W, 4WD >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window System >> System Tests >> Test E: Vent Window Inoperative
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test E: Vent Window Inoperative

NOTE: After repair, clear Diagnostic Trouble Codes (DTCs) and retest system.
  1. If vehicle is equipped with moon roof, go to next step. If vehicle is not equipped with moon roof, go to step  3 .
  2. Turn ignition switch to RUN position. Verify moon roof operation. If moon roof operates properly, go to step  4 . If moon roof does not operate properly, repair moon roof as necessary. See POWER MOON ROOFS - EXPEDITION & NAVIGATOR article.
  3. Verify vent windows operation. If both vent windows operate, go to step  13 . If both vent windows do not operate, go to step  20 . If only left rear vent window does not operate, go to step  6 .
  4. Verify vent windows operation. If both vent windows operate, go to step  13 . If both vent windows do not operate, go to next step. If left rear vent window does not operate, go to step  6 .
  5. Turn ignition switch to LOCK position. Disconnect left rear vent window switch harness connector. Measure resistance between ground and left vent window switch harness connector terminal No. 7 (Black wire). See Figure . If resistance is less than 5 ohms, repair Pink/Light Green wire between left rear vent window switch, right rear vent window switch and/or battery Junction Box (BJB). See WIRING DIAGRAMS  . If resistance is 5 ohms or more, repair open or high resistance in Black wire.
  6. Turn ignition switch to LOCK position. Disconnect left rear vent window switch 7-pin harness connector. Turn ignition switch to RUN position. Measure voltage between ground and left rear vent window switch harness connector terminal No. 4 (Pink/Light Green wire). See Figure . If more than 10 volts exists, go to next step. If 10 volts or less exists, repair Pink/Light Green wire. See WIRING DIAGRAMS  .
  7. Turn ignition switch to LOCK position. Measure resistance between ground and left rear vent window switch harness connector terminal No. 1 (Black wire) and No. 2 (Black wire). See Figure . If resistance is less than 5 ohms, go to next step. If any resistance is 5 ohms or more, repair open or high resistance in appropriate Black wire(s).
  8. Test left rear vent window switch. See POWER VENT WINDOW SWITCH  under COMPONENT TESTS. If switch is okay, go to next step. If switch is faulty, replace left rear vent window switch.
  9. Disconnect left rear vent window motor harness connector. Connector is located at left rear corner panel. Measure resistance of Yellow/Light Blue wire between vent window motor harness connector and left rear vent window switch harness connector terminal No. 3. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace repair open or high resistance in Yellow/Light Blue wire.
  10. Measure resistance between ground and left rear vent window switch harness connector terminal No. 3 (Yellow/Light Blue wire). See Figure . If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Yellow/Light Blue wire.
  11. Measure resistance of White/Light Blue wire between left rear vent window motor harness connector and left rear vent window switch harness connector terminal No. 6. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Light Blue wire.
  12. Measure resistance between ground and left rear vent window switch harness connector terminal No. 6 (White/Light Blue wire). See Figure . If resistance is more than 10 k/ohms, replace left rear vent window motor. If resistance is 10 k/ohms or less, repair short to ground in White/Light Blue wire.
  13. Turn ignition switch to LOCK position. Disconnect right rear vent window switch harness connector. Turn ignition switch to RUN position. Measure voltage between ground and right rear vent window switch harness connector terminal No. 4 (Pink/Light Green wire). See Figure . If more than 10 volts exists, go to next step. If 10 volts or less exists, repair open in Pink/Light Green wire.
  14. Turn ignition switch to LOCK position. Measure resistance between ground and right rear vent window switch harness connector terminals No. 1 (Black wire) and No. 2 (Black wire). See Figure . If each resistance is less than 5 ohms, go to next step. If either resistance is 5 ohms or more, repair open or high resistance in appropriate Black wire(s). See WIRING DIAGRAMS  .
  15. Test right rear vent window switch. See POWER VENT WINDOW SWITCH  under COMPONENT TESTS. If switch is okay, go to next step. If switch is faulty, replace vent window switch.
  16. Disconnect right rear vent window motor harness connector. Connector is located at right rear corner panel. Measure resistance of Yellow/Red wire between right rear vent window motor harness connector and right rear vent window switch harness connector terminal No. 3. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Yellow/Red wire.
  17. Measure resistance between ground right rear vent window switch harness connector terminal No. 3 (Yellow/Red wire). See Figure . If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Yellow/Red wire.
  18. Measure resistance of White/Red wire between right rear vent window motor harness connector and right rear vent window switch harness connector terminal No. 6. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Red wire.
  19. Measure resistance between ground and right rear vent window switch harness connector terminal No. 6 (White/Red wire). See Figure . If resistance is more than 10 k/ohms, replace right rear vent window motor. If resistance is 10 k/ohms or less, repair short to ground in White/Red wire.
  20. Remove accessory delay relay from CJB. Turn ignition switch to RUN position. Measure voltage between ground and accessory delay relay socket terminal No. 30. See Figure . If more than 10 volts exists, go to next step. If 10 volts or less exists, repair open in Red/Light Blue wire between CJB and Battery Junction Box (BJB). See WIRING DIAGRAMS  .
  21. Measure voltage between ground and vent window/moon roof relay socket terminal No. 86. See Figure . If more than 10 volts exists, go to next step. If 10 volts or less exists, go to TEST D: ONE-TOUCH DOWN FEATURE INOPERATIVE  .
  22. Turn ignition switch to LOCK position. Measure resistance between ground and accessory delay relay socket terminal No. 85. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire. Ground point is near left rear wheelwell.
  23. Test accessory delay relay. See MINI RELAYS  under COMPONENT TESTS. If relay is okay, go to next step. If relay is faulty, replace accessory delay relay.
  24. Measure resistance between ground and right rear vent window switch harness connector terminal No. 7 (Black wire). See Figure . If resistance is less than 5 ohms, repair Pink/Light Green wire between left rear vent window switch, right rear vent window switch and/or battery Junction Box (BJB). If resistance is 5 ohms or more, repair open in Black wire. See WIRING DIAGRAMS  .
scientia non olet · About LEMON Manuals