FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) Power Seat Power Easy Access System Function does not Operate

DESCRIPTION


WIRING DIAGRAM

A01MIY3E19
A01MIY3E20

CAUTION / NOTICE / HINT

Note


  • The front power seat control system (w/ Memory) uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

When troubleshooting a function, first make sure that the function is set to the default setting.

Click here

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the front power seat switch LH*1 or front power seat switch RH*2.

      Click here


      • *1: for LHD

      • *2: for RHD

      Result
      Result Proceed to
      Power seat functions operate normally A
      All power seat functions do not operate B
      One or more power seat motors do not operate C

    C

    GO TO OTHER FLOW CHART (One or more Power Seat Motors do not Operate) Click here

    B

    GO TO OTHER FLOW CHART (Front Power Seat does not Operate with Front Power Seat Switch) Click here

    A

  2. READ VALUE USING GTS (DRIVER SEAT BUCKLE SW)


    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
      Driver Seat Buckle SW Driver seat belt buckle switch ON or OFF

      ON: Driver seat belt fastened

      OFF: Driver seat belt unfastened

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Driver Seat Buckle SW
      OK
      On the GTS screen, the item changes between ON and OFF according to the above.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG (for LHD) C
      NG (for RHD) D

    B

    CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - IG POWER SUPPLY) Click here

    C

    INSPECT FRONT SEAT INNER BELT ASSEMBLY LH Click here

    D

    INSPECT FRONT SEAT INNER BELT ASSEMBLY RH Click here

    A

  3. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - IG POWER SUPPLY)


    1. A01MIWIC03
      *a

      Front view of wire harness connector

      (to Front Seat Outer Belt Assembly LH)

      Disconnect the front seat outer belt assembly LH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P12-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      P12-1 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY LH - FRONT POWER SEAT SWITCH LH)


    1. Disconnect the P12 front seat outer belt assembly LH connector.

    2. Disconnect the a10 front power seat switch LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P12-2 (L) - a10-9 (RDC) Always Below 1 Ω
      P12-2 (L) - Body ground Always 10 kΩ or higher
      a10-9 (RDC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK SEAT BELT TENSION REDUCER SYSTEM


    1. Check the seat belt tension reducer system.

      Click here

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

    NG

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH Click here

    OK

  6. CHECK POWER SEAT EASY ACCESS SYSTEM


    1. Check the power seat easy access system.

      Click here

      OK
      Power seat easy access system is normal.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  7. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - IG POWER SUPPLY)


    1. A01MIWIC04
      *a

      Front view of wire harness connector

      (to Front Seat Outer Belt Assembly RH)

      Disconnect the front seat outer belt assembly RH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Q11-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Q11-1 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (FRONT SEAT OUTER BELT ASSEMBLY RH - FRONT POWER SEAT SWITCH RH)


    1. Disconnect the Q11 front seat outer belt assembly RH connector.

    2. Disconnect the Z5 front power seat switch RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q11-2 (L) - Z5-9 (DRDC) Always Below 1 Ω
      Q11-2 (L) - Body ground Always 10 kΩ or higher
      Z5-9 (DRDC) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  9. CHECK SEAT BELT TENSION REDUCER SYSTEM


    1. Check the seat belt tension reducer system.

      Click here

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

    NG

    REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH Click here

    OK

  10. CHECK POWER SEAT EASY ACCESS SYSTEM


    1. Check the power seat easy access system.

      Click here

      OK
      Power seat easy access system is normal.
      Result
      Proceed to
      OK
      NG

    OK

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  11. INSPECT FRONT SEAT INNER BELT ASSEMBLY LH


    1. Remove the front seat inner belt assembly LH.

      Click here

    2. Inspect the front seat inner belt assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT SEAT INNER BELT ASSEMBLY LH)


    1. Disconnect the a10 front power seat switch LH connector.

    2. Disconnect the a11 front seat inner belt assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a10-10 (DBCL) - a11-1 Always Below 1 Ω
      a10-10 (DBCL) - Body ground Always 10 kΩ or higher
      a11-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  13. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH


    1. Remove the front seat inner belt assembly LH.

      Click here

    2. Inspect the front seat inner belt assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT SEAT INNER BELT ASSEMBLY RH)


    1. Disconnect the Z5 front power seat switch RH connector.

    2. Disconnect the Z8 front seat inner belt assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z5-10 (DBCL) - Z8-1 Always Below 1 Ω
      Z5-10 (DBCL) - Body ground Always 10 kΩ or higher
      Z8-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR