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Home >> Ford >> 2000 >> Expedition 4.6 6, RWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Power Seat System >> System Tests >> Test F: Power Seat Does Not Move Horizontally/Vertically

Test F: Power Seat Does Not Move Horizontally/Vertically

CAUTION: On models equipped with side air bags, Air Bag Simulators (Restraint Diagnostic Tool 105-R0012) MUST be connected to all air bag floor connector. After diagnosing/repairing, restraint system diagnostic tool must be removed prior to operating vehicle.
WARNING: On models equipped with side air bags, system must be deactivated. To deactivate air bag system, disconnect negative battery cable and wait one minute.
  1. If driver's power seat operates correctly, go to step  13 . If problem is with driver's power seat, go to next step.
  2. Operate driver's seat forward and rearward. If the track will move horizontally, go to step  6 . If track will not move horizontally, go to next step.
  3. Disconnect driver's seat motor assembly connector. Measure voltage between terminals No. 1 (Yellow/White wire) and No. 2 (Red/White wire) at seat motor assembly connector, while pushing forward/reverse switch forward and backward. See Fig 1 . Voltage should be more than 10 volts when forward/reverse switch is pushed forward, zero volts when switch is in rest position and more than 10 volts with opposite polarity when switch is pushed backward. If voltage is as specified, replace seat motor assembly. See SEAT MOTOR ASSEMBLY  under REMOVAL & INSTALLATION. If voltage is not as specified, go to next step.
  4. Disconnect seat control switch connector. Measure resistance of Yellow/White wire between seat control switch connector terminal No. 7 and seat motor assembly connector terminal No. 2. See Figure and Fig 1 . Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 7 (Yellow/White wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open in Yellow/White wire.
  5. Measure resistance of Red/White wire between seat control switch connector terminal No. 6 and seat motor assembly connector terminal No. 1. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 6 (Red/White wire) at seat control switch connector. Resistance should be greater than 10 k/ohms, If resistances are as specified, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistances are not as specified, repair short to ground in Red/White wire.
  6. Determine seat tilt failure. If only forward tilt operates, go to next step. If only rear tilt operates, go to step  10 . If seat cannot be tilted either way, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION.
  7. Disconnect seat motor assembly connector. Measure voltage between seat motor assembly connector terminals No. 4 (Red/Light Green wire) and No. 6 (Yellow/Light Green wire) while pressing rear tilt switch up and down. See Fig 1 . Voltage should be more than 10 volts when rear tilt switch is pressed up, zero volts when switch is in rest position and more than 10 volts with opposite polarity when rear tilt switch is pressed down. If voltage is as specified, replace seat motor assembly. See SEAT MOTOR ASSEMBLY  under REMOVAL & INSTALLATION. If voltage is not as specified, go to next step.
  8. Disconnect seat control switch connector. Measure resistance of Red/Light Green wire between seat control switch connector terminal No. 2 and seat motor assembly connector terminal No. 4. See Figure and Fig 1 . Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 2 (Red/Light Green wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open or short to ground in Red/Light Green wire.
  9. Measure resistance of Yellow/Light Green wire between seat control switch connector terminal No. 3 and seat motor assembly connector terminal No. 6. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 3 (Yellow/Light Green wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistances are not as specified, repair open or short to ground in Yellow/Light Green wire.
  10. Disconnect seat motor assembly connector. Measure voltage between seat motor assembly connector terminals No. 5 (Red/Light Blue wire) and No. 3 (Yellow/Light Blue wire) while pressing front tilt switch up and down. See Fig 1 . Voltage should be more than 10 volts when front tilt switch is pressed up, zero volts when switch is in rest position and more than 10 volts with opposite polarity when front tilt switch is pressed down. If voltage is as specified, replace seat motor assembly. See SEAT MOTOR ASSEMBLY  under REMOVAL & INSTALLATION. If voltage is not as specified, go to next step.
  11. Disconnect seat control switch connector. Measure resistance of Red/Light Blue wire between seat control switch connector terminal No. 5 and seat motor assembly connector terminal No. 5. See Figure and Fig 1 . Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 5 (Red/Light Blue wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open or short to ground in Red/Light Blue wire.
  12. Measure resistance of Yellow/Light Blue wire between seat control switch connector terminal No. 1 and seat motor assembly connector terminal No. 3. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 1 (Yellow/Light Blue wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistances are not as specified, repair open or short to ground in Yellow/Light Blue wire.
  13. Operate passenger's seat forward and rearward. If track will move horizontally, go to step  17 . If track will not move horizontally, go to next step.
  14. Disconnect passenger's seat motor assembly connector. Measure voltage between terminals No. 1 (Yellow/White wire) and No. 2 (Red/White wire) at passenger's seat motor assembly connector, while pushing forward/reverse switch forward and backward. See Fig 1 . Voltage should be greater than 10 volts when forward/reverse switch is pushed forward, zero volts when switch is in rest position and greater than 10 volts with opposite polarity when switch is pushed backward. If voltages are as specified, replace seat motor assembly. See SEAT MOTOR ASSEMBLY  under REMOVAL & INSTALLATION. If voltages are not as specified, go to next step.
  15. Disconnect seat control switch connector. Measure resistance of Yellow/White wire between seat control switch connector terminal No. 6 and seat motor assembly connector terminal No. 1. See Figure and Fig 1 . Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 6 (Yellow/White wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open or short to ground in Yellow/White wire.
  16. Measure resistance of Red/White wire between seat control switch connector terminal No. 7 and seat motor assembly connector terminal No. 2. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 7 (Red/White wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistances are not as specified, repair open or short to ground in Red/White wire.
  17. Determine seat tilt fault. If only forward tilt operates, go to next step. If only rear tilt operates, go to step  21 . If seat cannot be tilted either way, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION.
  18. Disconnect seat motor assembly connector. Measure voltage between terminals No. 5 (Red/Light Green wire) and No. 3 (Yellow/Light Green wire) at seat motor assembly connector, while pressing rear tilt switch up and down. See Fig 1 . Voltage should be more than 10 volts when rear tilt switch is pressed up, zero volts when switch is in rest position and more than 10 volts with opposite polarity when rear tilt switch is pressed down. If voltages are as specified, replace seat motor assembly. See SEAT MOTOR ASSEMBLY  under REMOVAL & INSTALLATION. If voltages are not as specified, go to next step.
  19. Disconnect seat control switch connector. Measure resistance of Red/Light Green wire between seat control switch connector terminal No. 2 and seat motor assembly connector terminal No. 5. See Figure and Fig 1 . Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 2 (Red/Light Green wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open or short to ground in Red/Light Green wire.
  20. Measure resistance of Yellow/Light Green wire between seat control switch connector terminal No. 3 and seat motor assembly connector terminal No. 3. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 3 (Yellow/Light Green wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistances are not as specified, repair open or short to ground in Yellow/Light Green wire.
  21. Disconnect seat motor assembly connector. Measure voltage between terminals No. 4 (Red/Light Blue wire) and No. 6 (Yellow/Light Blue wire) at seat motor assembly connector, while pressing front tilt switch up and down. See Fig 1 . Voltage should be more than 10 volts when front tilt switch is pressed up, zero volts when switch is in rest position and more than 10 volts with opposite polarity when front tilt switch is pressed down. If voltages are as specified, replace seat motor assembly. See SEAT MOTOR ASSEMBLY  under REMOVAL & INSTALLATION. If voltages are not as specified, go to next step.
  22. Disconnect seat control switch connector. Measure resistance of Red/Light Blue wire between seat control switch connector terminal No. 5 and seat motor assembly connector terminal No. 4. See Figure and Fig 1 . Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 5 (Red/Light Blue wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, go to next step. If resistances are not as specified, repair open or short to ground in Red/Light Blue wire.
  23. Measure resistance of Yellow/Light Blue wire between seat control switch connector terminal No. 1 and seat motor assembly connector terminal No. 6. Resistance should be 5 ohms or less. Measure resistance between ground and terminal No. 1 (Yellow/Light Blue wire) at seat control switch connector. Resistance should be greater than 10 k/ohms. If resistances are as specified, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistances are not as specified, repair open or short to ground in Yellow/Light Blue wire.
Fig 1: Identifying Seat Motor Assembly Connector Terminals
G98C01784Courtesy of FORD MOTOR CO.
Fig 2: Identifying Driver's Seat Module (DSM) Connector C351 Terminals
G95C34928Courtesy of FORD MOTOR CO.
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