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Front Power Seat Control System (W/Memory) - Diagnosis: Pre-Check

  1. DIAGNOSIS SYSTEM 
    1. Description
      1. The position control ECU & switch on this vehicle control the functions of the front power seat control system with memory.

        Data of the system can be read by the Data Link Connector 3 (DLC3) of the vehicle. Therefore, when the system seems to be malfunctioning, use the hand-held tester to check for a malfunction and repair it.

    2. Inspect the DLC3.

      The vehicle's ECM uses ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with the SAE J1962 and matches the ISO 9141-2 format.

      Fig 1: Identifying DLC3 Connectors
      G03487319Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      DLC3 CONNECTOR TERMINALS SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      7 (Bus + line) - 5 (Signal ground) During communication Pulse generation
      4 (Chassis ground) - Body ground Always Below 1 Ω
      5 (Signal ground) - Body ground Always Below 1 Ω
      16 (B+) - Body ground Always 10 to 14 V

      HINT:

      If the screen displays UNABLE TO CONNECT TO VEHICLE after you connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and used the hand-held tester, the problem may be on the vehicle side or the tester side.

      • If communication is normal when the tester is connected to other vehicle, inspect the DLC3 of the original vehicle.
      • If communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself so consult the Service Department listed in the tester's instruction manual.
  2. DATA LIST 

    HINT:

    Using the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Read the DATA LIST according to the display on the tester.

      Standard: Power window regulator master switch assy 

      DATA LIST (POWER WINDOW REGULATOR MASTER SWITCH ASSY)

      Item Measurement Item/Display (Range) Normal Condition
      SEAT SET SW Seat memory set switch signal/ON or OFF ON: Seat memory set switch is ON
      OFF: Seat memory set switch is OFF
      SEAT MEM M1 Seat memory switch M1 signal/ON or OFF ON: Seat memory switch M1 is ON
      OFF: Seat memory switch M1 is OFF
      SEAT MEM M2 Seat memory switch M2 signal/ON or OFF ON: Seat memory switch M2 is ON
      OFF: Seat memory switch M2 is OFF

      Standard: Position control ECU & switch assy 

      DATA LIST (POSITION CONTROL ECU & SWITCH ASSY)

      Item Measurement Item/Display (Range) Normal Condition
      RECLINE SW REAR Reclining switch signal (Rearward)/ON or OFF ON: Reclining switch (Rearward) is ON
      OFF: Reclining switch (Rearward) is OFF
      RECLINE SW FRONT Reclining switch signal (Forward)/ON or OFF ON: Reclining switch (Forward) is ON
      OFF: Reclining switch (Forward) is OFF
      F VTCL SW DOWN Front vertical switch signal (Downward)/ON or OFF ON: Front vertical switch (Downward) is ON
      OFF: Front vertical switch (Downward) is OFF
      F VTCL SW UP Front vertical switch signal (Upward)/ON or OFF ON: Front vertical switch (Upward) is ON
      OFF: Front vertical switch (Upward) is OFF
      LIFTER SW DOWN Lifter switch signal (Downward)/ON or OFF ON: Lifter switch (Downward) is ON
      OFF: Lifter switch (Downward) is OFF
      LIFTER SW UP Lifter switch signal (Upward)/ON or OFF ON: Lifter switch (Upward) is ON
      OFF: Lifter switch (Upward) is OFF
      SLIDE SW REAR Sliding switch signal (Rearward)/ON or OFF ON: Sliding switch (Rearward) is ON
      OFF: Sliding switch (Rearward) is OFF
      SLIDE SW FRONT Sliding switch signal (Forward)/ON or OFF ON: Sliding switch (Forward) is ON
      OFF: Sliding switch (Forward) is OFF
      POWER VOLTAGE Power supply for position control ECU & switch/MIN: 0 V, MAX: 19.89 V Within range from 11 V to 14 V
      IG SW Ignition switch status/ON or OFF ON Ignition switch is ON
      OFF: Ignition switch is OFF
      KEY UNLOCK SW Key unlock warning switch signal/ON or OFF ON: Key is in ignition key cylinder
      OFF: Key is not in ignition key cylinder
      D-DOOR WARN SW Door courtesy switch signal/ON or OFF ON: Driver side door is open
      OFF: Driver side door is closed
      PNP SW Park/neutral position switch signal/ON or OFF ON: Shift lever in neutral position
      OFF: Shift lever in any position except neutral
      M2 SW Seat memory switch M2 signal/ON or OFF ON: Seat memory switch M2 is ON
      OFF: Seat memory switch M2 is OFF
      M1 SW Seat memory switch M1 signal/ON or OFF ON: Seat memory switch M1 is ON
      OFF: Seat memory switch M1 is OFF
      SET SW Seat memory set switch signal/ON or OFF ON: Memory set switch is ON
      OFF: Memory set switch is OFF
      SLIDE POS Seat sliding position/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      RECLINE POS Seatback position/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      F VTCL POS Seat front vertical position/MIN: -4096 MAX: 4096 Within range from -4096 to 4096
      LIFTER POS Seat lifter position/MIN: -4096 MAX: 4096 Within range from -4096 to 4096
      MEM M1 SW Driving position memorized with seat memory switch M1/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      MEM M2 SW Driving position memorized with seat memory switch M2/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      SEAT MEM M1 Seat position memorized with seat memory switch M1/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      SEAT MEM M2 Seat position memorized with seat memory switch M2/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      D-MIRR MEM1 Driver side mirror position memorized with seat memory switch M1/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      D-MIRR MEM2 Driver side mirror position memorized with seat memory switch M2/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      P-MIRR MEM M1 Passenger side mirror position memorized with seat memory switch M1/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      P-MIRR MEM M2 Passenger side mirror position memorized with seat memory switch M2/MEM or NOT MEM MEM: Memorized
      NOT MEM: Not memorized
      SLIDE MEM POS 1 Seat sliding position memorized with seat memory switch M1/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      RECLINE MEM POS 1 Seatback position memorized with seat memory switch M1/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      F VTCL MEM POS 1 Front vertical position memorized with seat memory switch M1/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      LIFTER MEM POS 1 Lifter position memorized with seat memory switch M1/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      SLIDE MEM POS 2 Seat sliding position memorized with seat memory switch M2/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      RECLINE MEM POS 2 Seatback position memorized with seat memory switch M2/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      F VTCL MEM POS 2 Front vertical position memorized with seat memory switch M2/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      LIFTER MEM POS 2 Lifter position memorized with seat memory switch M2/MIN: -4096, MAX: 4096 Within range from -4096 to 4096
      D-MIRR MEM POS 1 Driver side mirror position memorized with seat memory switch M1/MIN: 0, MAX: 65535 Within range from 0 to 65535
      P-MIRR MEM POS 1 Passenger side mirror position memorized with seat memory switch. M1/MIN: 0, MAX: 65535 Within range from 0 to 65535
      D-MIRR MEM POS 2 Driver side mirror position memorized with seat memory switch M2/MIN: 0, MAX: 65535 Within range from 0 to 65535
      P-MIRR MEM POS 2 Passenger side mirror position memorized with seat memory switch M2/MIN: 0, MAX: 65535 Within range from 0 to 65535
  3. ACTIVE TEST 

    HINT:

    Performing the ACTIVE TEST using the hand-held tester allows you to operate the seat motors without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten the labor time.

    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch ON.
    3. Perform the ACTIVE TEST according to the display on the tester.

      Standard: Position control ECU & switch assy 

      ACTIVE TEST (POSITION CONTROL ECU & SWITCH ASSY)

      Item Test Details Diagnostic Note
      RECLINING Test Detail:
      Reclining operation FRONT/REAR
      Vehicle Condition:
      Vehicle is stopped      		 -
      F VERTICAL Test Detail:
      Front vertical operation UP/DOWN
      Vehicle Condition:
      Vehicle is stopped      		 -
      LIFTER Test Detail:
      Lifter operation UP/DOWN
      Vehicle Condition:
      Vehicle is stopped      		 -
      SLIDE Test Detail:
      Lifter operation UP/DOWN
      Vehicle Condition:
      Vehicle is stopped      		 -
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