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Test E: Power Seat Does Not Move Horizontal/Vertical

CAUTION: Side air bag system must be deactivated for diagnosis of power seat (if equipped). See AIR BAG RESTRAINT SYSTEMS - EXPLORER & MOUNTAINEER article. Air Bag Simulator (418-F088) must be installed under seats to floor connector, and removed before operating vehicle.
NOTE: Before beginning this test, ensure seat and seat track are free from all obstructions. Test applies to passenger's seat and driver's seat without memory. For driver's seat with memory, perform TEST G: MEMORY SEAT INOPERATIVE  .
  1. Deactivate air bag system. See AIR BAG RESTRAINT SYSTEMS - EXPLORER & MOUNTAINEER article. Turn ignition switch to LOCK position. Attempt to operate inoperative seat in forward and rearward directions. If seat moves horizontally, go to next step. If seat does not move horizontally, go to step  9 .
  2. Attempt to operate inoperative seat in both tilting directions. If rear height motor only does not operate, go to next step. If front height motor only does not operate, go to step  6 . If both front and rear height motors do not operate, replace seat control switch. Recheck system operation.
  3. Disconnect inoperative seat motor assembly harness connector. On driver's seat, measure voltage between seat motor assembly harness connector terminals No. 1 (Yellow/Light Blue wire) and No. 4 (Yellow/White wire). See Fig 1 . On passenger's seat, measure voltage between seat motor assembly harness connector terminals No. 2 (Red/Light Blue wire) and No. 3 (Red/White wire). On either seat, operate rear height switch up and down while observing voltmeter. With switch in UP position, more than 10 volts should exist. With switch in DOWN position, more than 10 volts should exist with polarity reversed. With switch in neutral position, zero volts should exist. If voltage is not as specified, go to next step. If voltage is as specified, replace seat track. See POWER SEAT TRACK ASSEMBLY  under REMOVAL & INSTALLATION.
    Fig 1: Identifying Seat Motor Assembly Harness Connectors Terminals
    G96B31345Courtesy of FORD MOTOR CO.
  4. Disconnect suspect seat control switch 8-pin harness connector. On driver's seat, measure resistance of Yellow/Light Blue wire between seat control switch harness connector terminal No. 1 and seat motor assembly harness connector terminal No. 1. See Figure and Fig 1 . On passenger's seat, measure resistance of Red/Light Green wire between seat control switch harness connector terminal No. 1 and seat motor assembly harness connector terminal No. 3. On either seat, if resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open or high resistance in appropriate wire. Recheck system operation.
  5. On driver's seat, measure resistance of Yellow/White wire between seat control switch harness connector terminal No. 6 and driver's seat motor assembly harness connector terminal No. 4. On passenger's seat, measure resistance of Red/Light Blue wire between seat control switch harness connector terminal No. 6 and passenger's seat motor assembly harness connector terminal No. 2. On either seat, if resistance is less than 5 ohms, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. Recheck system operation. If resistance is 5 ohms or more, repair open or high resistance in appropriate wire. Recheck system operation.
  6. Disconnect inoperative seat motor assembly 6-pin harness connector. On driver's seat, measure voltage between seat motor assembly harness connector terminals No. 2 (Red/Light Blue) and No. 3 (Red/White wire). See Fig 1 . On passenger's seat, measure voltage between seat motor assembly harness connector terminal No. 1 (Yellow/Light Blue wire) and No. 4 (Yellow/White wire). Operate inoperative seat front height switch up and down while observing voltmeter. With switch in UP position, more than 10 volts should exist. With switch in DOWN position, more than 10 volts should exist with polarity reversed. With switch in neutral position, zero volts should exist. If voltage is not as specified, go to next step. If voltage is as specified, replace seat track. See POWER SEAT TRACK ASSEMBLY  under REMOVAL & INSTALLATION.
  7. Disconnect suspect seat control switch 8-pin harness connector. On driver's seat, measure resistance of Red/Light Blue wire between seat control switch harness connector terminal No. 7 and seat motor assembly harness connector terminal No. 2. See Figure and Fig 1 . On passenger's seat, measure resistance of Yellow/White wire between seat control switch harness connector terminal No. 7 and seat motor assembly harness connector terminal No. 4. On either seat, if resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in appropriate wire. Recheck system operation.
  8. On driver's seat, measure resistance of Red/White wire between seat control switch harness connector terminal No. 5 and seat motor assembly harness connector terminal No. 3. On passenger's seat, measure resistance of Yellow/Light Blue wire between seat control switch harness connector terminal No. 5 and seat motor assembly harness connector terminal No. 1. On either seat, if resistance is less than 5 ohms, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. Recheck system operation. If resistance is 5 ohms or more, repair open or high resistance in appropriate wire. Recheck system operation.
  9. Disconnect inoperative seat motor assembly 6-pin harness connector. On driver's seat, measure voltage between seat motor assembly harness connector terminals No. 5 (Red/Light Green wire) and No. 6 (Yellow/Light Green wire) . See Fig 1 . On passenger's seat, measure voltage between seat motor assembly harness connector terminals No. 5 (Red/Light Green wire) and No. 6 (Yellow/Light Green wire). On inoperative seat, operate center switch forward and rearward while observing voltmeter. With switch in FORWARD position, more than 10 volts should exist. With switch in REARWARD position, more than 10 volts should exist with polarity reversed. With switch in neutral position, zero volts should exist. If voltage is not as specified, go to next step. If voltage is as specified, replace seat track. See POWER SEAT TRACK ASSEMBLY  under REMOVAL & INSTALLATION.
  10. Disconnect suspect seat control switch 8-pin harness connector. On driver's seat, measure resistance of Yellow/Light Green wire between seat control switch harness connector terminal No. 3 and seat motor assembly harness connector terminal No. 6. On passenger's seat, measure resistance of Yellow/Light Green wire between seat control switch harness connector terminal No. 3 and seat motor assembly harness connector terminal No. 6. On either seat, if resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in appropriate wire. Recheck system operation.
  11. On driver's seat, measure resistance of Red/Light Green wire between seat control switch harness connector terminal No. 8 and seat motor assembly harness connector terminal No. 5. On passenger's seat, measure resistance of Red/Light Green wire between seat control switch harness connector terminal No. 8 and seat motor assembly harness connector terminal No. 5. On either seat, if resistance is less than 5 ohms, replace seat control switch. See SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistance is 5 ohms or more, repair open in Red/Light Green wire.
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