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Test G: Memory Seat Only Moves In One Second Intervals/Memory Seat Does Not Operate Using Memory Switch

WARNING: Vehicle may be equipped with seatback-mounted air bags. Deactivate air bag system before performing any service operation involving seat components. See appropriate AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.
CAUTION: On models equipped with side air bags, Air Bag Simulator (40-009) MUST be connected to all air bag floor harness connectors. After diagnosis/repair, air bag simulator must be removed prior to operating vehicle.
  1. Ensure vehicle is in Park. Turn ignition switch to LOCK position. Using NGS tester, retrieve and record continuous DTCs. Clear DTCs and perform DSM self-test. During DSM self-test, note when memory set LED lights and turns off. If any DTCs are retrieved, perform appropriate test. See TEST "G" DIAGNOSTIC TROUBLE CODE TEST INDEX  table. If no DTCs are retrieved, go to next step. If memory set LED fails to light during self-test, go to step  5.
    TEST "G" DIAGNOSTIC TROUBLE CODES TEST INDEX

    DTC Go To Step
    B1342 (1)
    B1529, B1533 Or B1537  3
    If B1950, B1954 & B1962 Are Set Together  9
    B1950, B1952 Or B1664  13
    B1954, B1956 Or B1663  10
    B1962, B1964 Or B1665  16
    (1) Replace DSM. See DRIVER'S SEAT MODULE  under REMOVAL & INSTALLATION. Clear DTCs and retest system.
  2. Using NGS tester, monitor DSM PIDs MEM1_SW, MEM2_SW, AND MEMS_SW while activating seat control switch. If PID values do not agree with switch positions and central junction box fuse No. 4 (7.5-amp) is okay, go to next step. If PID values agrees with switch positions, go to step  9. If PID values do not agree with switch positions and central junction box fuse No. 4 (7.5-amp) blows while operating memory set switch, go to step  7.
  3. Turn ignition switch to LOCK position. Disconnect memory set switch harness connector C503. Test memory set switch. See MEMORY SET SWITCH  under COMPONENT TESTS. If switch is okay, go to next step. If switch is defective, replace memory set switch.
  4. Turn ignition switch to RUN position. Measure voltage between ground and memory set switch harness connector C503 terminal No. 6 (Orange/Light Green wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Orange/Light Green wire between memory set switch and central junction box. See WIRING DIAGRAMS .
  5. Turn ignition switch to LOCK position. Measure resistance between ground and memory set switch harness connector C503 terminal No. 9 (Black/Light Blue wire). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Black/Light Blue wire between memory set switch and ground. Ground point is located behind left kick panel. See WIRING DIAGRAMS .
  6. Turn ignition switch to LOCK position. Disconnect Driver's Seat Module (DSM) harness connector C356 and Central Security Module (CSM) harness connector C257. Turn ignition switch to ON position. Measure voltage between ground and indicated terminals. See MEMORY SET SWITCH TEST TERMINALS  table. See Fig 1. If voltage does not exist, go to next step. If any voltage is indicated, repair short to voltage in appropriate wire(s) between memory set switch and DSM. See WIRING DIAGRAMS .
    MEMORY SET SWITCH TEST TERMINALS

    Memory Set Switch Harness Connector Terminal No. Wire Color
    1 Brown/Orange
    3 Black/Orange
    4 Brown/Light Green
    8 White/Orange
  7. Turn ignition switch to LOCK position. Measure resistance between ground and indicated memory set switch terminals. See MEMORY SET SWITCH TEST TERMINALS  table. See Figure. If any resistance is more than 10 k/ohms, go to next step. If any resistance is 10 k/ohms or less, repair short to ground in appropriate wire(s) between memory set switch and DSM. See WIRING DIAGRAMS .
  8. Measure resistance between memory set switch harness connector C503 terminals and DSM harness connector C356 terminals. See MEMORY SET SWITCH & DRIVER'S SEAT MODULE TEST TERMINALS  table. If resistances are 5 ohms or less, replace DSM. If resistances are more than 5 ohms, repair open in appropriate wire(s) between memory set switch and DSM. See WIRING DIAGRAMS .
    MEMORY SET SWITCH & DRIVER'S SEAT MODULE TEST TERMINALS

    Memory Set Switch Harness Connector Terminal No. Wire Color DSM Harness Connector Terminal No.
    1 Brown/Orange 3
    3 Black/Orange 15
    4 Brown/Light Green 16
    8 White/Orange 13
  9. Using seat control switch, place seat in central position. Observe DSM PIDs SFWD_P while operating seat control forward/rearward switch, SFNT_P while operating seat control front up/down switch and SREAR_P while operating seat control rear up/down switch. If PID SFNT_P values do not increase or decrease, go to next step. If PID values increase with forward/down movement and decrease with rearward/up movement through entire travel, replace DSM. See DRIVER'S SEAT MODULE  under REMOVAL & INSTALLATION. If PID REAR_P values do not increase or decrease, go to step  13. If PID SFWD_P values do not increase or decrease, go to step  16.
  10. Turn ignition switch to LOCK position. Disconnect DSM harness connector C351 and front height position sensor harness connector C303. Turn ignition switch to RUN position. Measure voltage between ground and front height position sensor harness connector (Light Green/Red wire). Measure voltage between ground and front height position sensor harness connector (Orange/Red wire). Measure voltage between ground and front height position sensor harness connector (Orange/White wire). If voltage is not indicated, go to next step. If any voltage is indicated, repair short to voltage in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  11. Turn ignition switch to LOCK position. Measure resistance between ground and front height position sensor harness connector (Light Green/Red wire). Measure resistance between ground and front height position sensor harness connector (Orange/Red wire). Measure resistance between ground and front height position sensor harness connector (Orange/White wire). If each resistance is more than 10 k/ohms, go to next step. If each resistance is 10 k/ohms or less, repair short to ground in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  12. Measure resistance in Light Green/Red wire between front height position sensor harness connector and DSM harness connector C351 terminal No. 9. Measure resistance in Orange/Red wire between front height position sensor harness connector and DSM harness connector C351 terminal No. 1. Measure resistance in Orange/White wire between front height position sensor harness connector and DSM harness connector C351 terminal No. 3. If each resistance is 5 ohms or less, replace seat track. If each resistance is more than 5 ohms, repair open in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  13. Ensure ignition switch is in LOCK position and DSM harness connector C351 is disconnected. Disconnect rear height position sensor harness connector C315. Measure voltage between ground and rear height position sensor (Light Green/Black wire). Measure voltage between ground and rear height position sensor (Orange/Red wire). Measure voltage between ground and rear height position sensor (Orange/White wire). If voltage does not exist, go to next step. If any voltage is indicated, repair short to voltage in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  14. Turn ignition switch to LOCK position. Measure resistance between ground and rear height position sensor (Light Green/Black wire). Measure resistance between ground and rear height position sensor (Orange/Red wire). Measure resistance between ground and rear height position sensor (Orange/White wire). If each resistance is more than 10 k/ohms, go to next step. If each resistance is 10 k/ohms or less, repair short to ground in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  15. Measure resistance in Light Green/Black wire between rear height position sensor harness connector and DSM harness connector C351 terminal No. 8. Measure resistance in Orange/Red wire between rear height position sensor harness connector and DSM harness connector C351 terminal No. 1. Measure resistance in Orange/White wire between rear height position sensor harness connector and DSM harness connector C351 terminal No. 3. If each resistance is 5 ohms or less, replace seat track. See SEAT TRACK  in REMOVAL & INSTALLATION. If each resistance is more than 5 ohms, repair open in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  16. Ensure ignition switch is in LOCK position and DSM harness connector C351 is disconnected. Disconnect forward/rearward position sensor harness connector C358. Measure voltage between ground and forward/rearward position sensor harness connector C358 (Light Green/Orange wire). Measure voltage between ground and forward/rearward position sensor harness connector C358 (Orange/Red wire). Measure voltage between ground and forward/rearward position sensor harness connector C358 (Orange/White wire). If voltage does not exist, go to next step. If any voltage is indicated, repair short to voltage in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  17. Ensure ignition switch is in LOCK position. Measure resistance between ground and forward/rearward position sensor harness connector C358 (Light Green/Orange wire). Measure resistance between ground and forward/rearward position sensor harness connector C358 (Orange/Red wire). Measure resistance between ground and forward/rearward position sensor harness connector C358 (Orange/White wire). If each resistance is more than 10 k/ohms, go to next step. If each resistance is 10 k/ohms or less, repair short to ground in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
  18. Measure resistance in Light Green/Orange wire between forward/rearward position sensor harness connector C358 and DSM harness connector C351 terminal No. 10. Measure resistance in Orange/Red wire between forward/rearward position sensor harness connector C358 and DSM harness connector C351 terminal No. 1. Measure resistance in Orange/White wire between forward/rearward position sensor harness connector C358 and DSM harness connector C351 terminal No. 3. If each resistance is 5 ohms or less, replace seat track. If each resistance is more than 5 ohms, repair open in appropriate wire(s) between seat motor assembly and DSM. See WIRING DIAGRAMS .
Fig 1: Identifying Driver's Seat Module Harness Connector C356 & Central Security Module Harness Connector C257 Terminals
G97D28772Courtesy of FORD MOTOR CO.
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