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

DESCRIPTION

When the power switch off or the shift lever is in P, the power seat slides rearwards when the seatbelt tongue plate is disengaged from the front seat inner belt assembly (driver side) (auto away function). Also the power seat slides forward when the seatbelt tongue plate is engaged to the front seat inner belt assembly (driver side) with the power switch on (ACC) or on (IG), or the shift lever in P.

WIRING DIAGRAM

A01NGOWE02

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally Click here.

      OK
      CAN communication DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK FRONT POWER SEAT OPERATION (DRIVER SIDE)


    1. Check that each function of the power seat operates normally by using the front power seat switch (driver side) Click here.

      Result
      Result Proceed to
      Power seat function normally A
      All power seat functions do not operate B (Front Power Seat does not Operate with Front Power Seat Switch)
      One or more power seat motors do not operate C (One or more Power Seat Motors do not Operate)

    B

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

    C

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

    A

  3. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Read the Data List according to the display on the intelligent tester.

      Driver Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Driver Seat Buckle SW Status of the driver seatbelt / ON or OFF

      ON: Tongue plate is engaged

      OFF: Tongue plate is not engaged

      		 -

    NG

    INSPECT FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE) Click here

    OK

  4. REPLACE FRONT POWER SEAT SWITCH (DRIVER SIDE)


    1. Replace the front power seat switch (driver side) Click here.


    NEXT

  5. CHECK POWER SEAT POWER EASY ACCESS SYSTEM


    1. Check that the power seat easy access system operates normally when engaging and disengaging the tongue plate of the seatbelt with the shift lever in P Click here.

      OK
      Power seat power easy access system is normally.

    NG

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

    OK

    END (FRONT POWER SEAT SWITCH (DRIVER SIDE) WAS DEFECTIVE)

  6. INSPECT FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)


    1. A01NCYYE01
      Text in Illustration
      *1

      Component without harness connected

      (Front Seat Inner Belt Assembly (Driver Side))

      for LHD.


      1. Remove the front seat inner belt assembly (driver side) Click here.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        a5-4 (E) - a5-5 (RDC) Tongue plate is engaged Below 1 Ω
        a5-4 (E) - a5-5 (RDC) Tongue plate is not engaged 10 kΩ or higher
    2. A01NCYYE02
      Text in Illustration
      *1

      Component without harness connected

      (Front Seat Inner Belt Assembly (Driver Side))

      for RHD.


      1. Remove the front seat inner belt assembly (driver side) Click here.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Z7-4 (E) - Z7-5 (RDC) Tongue plate is engaged Below 1 Ω
        Z7-4 (E) - Z7-5 (RDC) Tongue plate is not engaged 10 kΩ or higher

    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - FRONT SEAT INNER BELT)


    1. A01NHHVE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Power Seat Switch LH)
      *2

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly (Driver Side))

      for LHD.


      1. Disconnect the a8 connector from the front power seat switch LH.

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

        Standard Resistance
        Tester Condition Condition Specified Condition
        a8-4 (DBCL) - a5-5 (RDC) Always Below 1 Ω
        a5-4 (E) - Body ground Always Below 1 Ω
        a8-4 (DBCL) - Body ground Always 10 kΩ or higher
    2. A01NHHVE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Front Power Seat Switch RH)
      *2

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly (Driver Side))

      for RHD.


      1. Disconnect the Z25 connector from the front power seat switch RH.

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

        Standard Resistance
        Tester Condition Condition Specified Condition
        Z25-4 (DBCL) - Z7-5 (RDC) Always Below 1 Ω
        Z7-4 (E) - Body ground Always Below 1 Ω
        Z25-4 (DBCL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SIDE) Click here