FRONT POWER SEAT CONTROL SYSTEM One-touch Walk-in Function does not Operate

DESCRIPTION

When the reclining remote control lever sub-assembly is operated and the front seatback frame sub-assembly is folded forward, each limit switch is turned on and sends a signal to the position control ECU assembly according to the condition of the front seatback frame sub-assembly.

WIRING DIAGRAM


  1. for Driver Seat

    Figure 1. for LHD:

    B004BE6E09

    Figure 2. for RHD:

    B004BE6E11

  2. for Front Passenger Seat

    Figure 3. for LHD:

    B004BE6E04

    Figure 4. for RHD:

    B004BE6E12

CAUTION / NOTICE / HINT

Note


  • The front power seat control system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to SERVICE BULLETIN.

  • Initializing the position control ECU assembly will clear the seat position memory.

Tech Tips


  • Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

  • Before initializing the seat ECU, make sure that the D/C CUT fuse is normal.

  • When any of the following conditions are met, the seat position Information in the position control ECU assembly will be cleared.


    • The power switch is turned off with any of the seat switches being operated and the D/C CUT fuse removed.

    • The power switch is turned off within 1 second of any of the seat switches being operated with the D/C CUT fuse removed.

PROCEDURE


  1. CHECK SEAT BELT TENSION REDUCER SYSTEM


    1. Check the seat belt tension reducer system.

      OK
      Seat belt tension reducer system is normal.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO SEAT BELT TENSION REDUCER SYSTEM Click here

    OK

  2. CHECK FOR DTC (ELECTRONIC SHIFT LEVER SYSTEM)


    1. Perform "DTC Output Confirmation Operation" procedure.

      Click here

    2. Check for DTCs.

      Click here


      Powertrain > Hybrid Control > Trouble Codes
      OK
      DTS is not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO ELECTRONIC SHIFT LEVER SYSTEM Click here

    OK

  3. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the front power seat switch.

      Click here

      Result
      Result Proceed to
      Driver power seat functions do not operate A
      Front passenger power seat functions do not operate B

    B

    READ VALUE USING GTS (SHIFT P POSITION STATE) Click here

    A

  4. READ VALUE USING GTS (SHIFT SW POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Driver Seat / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Driver Seat > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift SW Position Park state signal Shift P or Shift Other

      Shift P: Shift lever in P

      Shift Other: Shift lever in a position other than P

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Shift SW Position
      OK
      The GTS display changes correctly in response to the shift lever position.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT) Click here

    OK

  5. READ VALUE USING GTS (OPERATION LEVER STATE AND SLIDE FRONT OPERATION PERMITTED)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Driver Seat / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Driver Seat > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Operation Lever State Reclining remote control lever sub-assembly state Lock or Unlock

      Lock: Reclining remote control lever sub-assembly locked

      Unlock: Reclining remote control lever sub-assembly unlocked

      		 -
      Slide Front Operation Permitted Forward operation permission state NO or YES

      NO: Not permitted

      YES: Permitted

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Operation Lever State
      Slide Front Operation Permitted
      Result
      Result Proceed to
      The value of each Data List item change accordingly. A
      The value of the Data List item "Operation Lever State"not change according to the operation of the reclining remote control lever sub-assembly. B
      The value of the Data List item "Slide Front Operation Permitted" does not change according to the forward operation permission state. C
      The value of each Data List item does not change. D

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    INSPECT FRONT SEAT BACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY) Click here

    D

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT) - FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY)) Click here

    B

  6. INSPECT FRONT SEATBACK EDGE PROTECTOR (INNER LIMIT SWITCH ASSEMBLY)


    1. Remove the front seatback edge protector (inner limit switch assembly).

      Click here

    2. Inspect the front seatback edge protector (inner limit switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK EDGE PROTECTOR (INNER LIMIT SWITCH ASSEMBLY) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR DRIVE SEAT) - FRONT SEATBACK EDGE PROTECTOR (INNER LIMIT SWITCH ASSEMBLY))


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w8 front seatback edge protector (inner limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-2 (FRLS) - w8-1 Always Below 1 Ω
        w12-2 (FRLS) or w8-1 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w8-2 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v8 front seatback edge protector (inner limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-2 (FRLS) - v8-1 Always Below 1 Ω
        v12-2 (FRLS) or v8-1 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v8-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY FOR DRIVER SEAT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. INSPECT FRONT SEAT BACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY)


    1. Remove the front seatback edge protector (outer limit switch assembly).

      Click here

    2. Inspect the front seatback edge protector (outer limit switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY) Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT) - FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY))


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-16 (LRLS) - y4-1 Always Below 1 Ω
        w12-16 (LRLS) or y4-1 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - y4-2 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-16 (LRLS) - x4-1 Always Below 1 Ω
        v12-16 (LRLS) or x4-1 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - x4-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY FOR DRIVER SEAT Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT) - FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY))


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-12 (SENG) - y4-2 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-12 (SENG) - x4-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. READ VALUE USING GTS (SHIFT P POSITION STATE)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Data List.

    5. Read the Data List according to the display on the Techstream.


      Body Electrical > Passenger Seat > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Shift SW Position Park state signal Shift P or Shift Other

      Shift P: Shift lever in P

      Shift Other: Shift lever in a position other than P

      		 -

      Body Electrical > Passenger Seat > Data List
      Tester Display
      Shift SW Position
      OK
      The Techstream display changes correctly in response to the shift lever position.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) Click here

    OK

  12. READ VALUE USING TECHSTREAM (OPERATION LEVER STATE AND SLIDE FRONT OPERATION PERMITTED)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Passenger Seat > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Operation Lever State Reclining remote control lever sub-assembly state Lock or Unlock

      Lock: Reclining remote control lever sub-assembly locked

      Unlock: Reclining remote control lever sub-assembly unlocked

      		 -
      Slide Front Operation Permitted Forward operation permission state NO or YES

      NO: Not permitted

      YES: Permitted

      		 -

      Body Electrical > Passenger Seat > Data List
      Tester Display
      Operation Lever State
      Slide Front Operation Permitted
      Result
      Result Proceed to
      The value of each Data List item change accordingly. A
      The value of the Data List item "Operation Lever State" does not change according to the operation of the reclining remote control lever sub-assembly. B
      The value of the Data List item "Slide Front Operation Permitted" does not change according to the forward operation permission state. C
      The value of each Data List item does not change. D

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    INSPECT FRONT SEAT BACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY) Click here

    D

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) - FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY)) Click here

    B

  13. INSPECT FRONT SEATBACK EDGE PROTECTOR (INNER LIMIT SWITCH ASSEMBLY)


    1. Remove the front seatback edge protector (inner limit switch assembly).

      Click here

    2. Inspect the front seatback edge protector (inner limit switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK EDGE PROTECTOR (INNER LIMIT SWITCH ASSEMBLY) Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) - FRONT SEATBACK EDGE PROTECTOR (INNER LIMIT SWITCH ASSEMBLY))


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v8 front seatback edge protector (inner limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-2 (FRLS) - v8-1 Always Below 1 Ω
        v12-2 (FRLS) or v8-1 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v8-2 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w8 front seatback edge protector (inner limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-2 (FRLS) - w8-1 Always Below 1 Ω
        w12-2 (FRLS) or w8-1 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w8-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. INSPECT FRONT SEAT BACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY)


    1. Remove the front seatback edge protector (outer limit switch assembly).

      Click here

    2. Inspect the front seatback edge protector (outer limit switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY) Click here

    OK

  16. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) - FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY))


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-16 (LRLS) - x4-1 Always Below 1 Ω
        v12-16 (LRLS) or x4-1 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - x4-2 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-16 (LRLS) - y4-1 Always Below 1 Ω
        w12-16 (LRLS) or y4-1 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - y4-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY (FOR PASSENGER SEAT) - FRONT SEATBACK EDGE PROTECTOR (OUTER LIMIT SWITCH ASSEMBLY))


    1. for LHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the x4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-12 (SENG) - x4-2 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the y4 front seatback edge protector (outer limit switch assembly) connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-12 (SENG) - y4-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR PASSNGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR