FRONT POWER SEAT CONTROL SYSTEM Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

When the front power seat switch is operated, a command signal is sent to the position control ECU. The position control ECU then controls the appropriate seat motor as needed. The position control ECU is designed so that a malfunction of the seat memory system will not interfere with manual seat control.

WIRING DIAGRAM

B0040I6E02

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (POSITION CONTROL ECU)


    1. Using the intelligent tester, read the Data List.

      Driver Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Voltage Power supply for position control ECU / MIN: 0 V, MAX: 19.89 V Within range from 11 V to 14 V -

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - BODY GROUND)

    B0040HWE02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Position Control ECU)

    • *1: for LHD

    • *2: for RHD


    1. Disconnect the O27*1 or O17*2 ECU connector.

    2. Disconnect the O26*1 or O16*2 ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      O27-1 (GND) - Body ground Always Below 1 Ω
      O26-21 (GND2) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      O17-1 (GND) - Body ground Always Below 1 Ω
      O16-21 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. READ VALUE USING INTELLIGENT TESTER (FRONT POWER SEAT SWITCH)


    1. Using the intelligent tester, read the Data List.

      Driver Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Reclining Rear Reclining switch signal (Rearward) / ON or OFF

      ON: Reclining switch (Rearward) on

      OFF: Reclining switch (Rearward) off

      		 -
      Reclining Front Reclining switch signal (Forward) / ON or OFF

      ON: Reclining switch (Forward) on

      OFF: Reclining switch (Forward) off

      		 -
      Front Vertical Down Front vertical switch signal (Downward) / ON or OFF

      ON: Front vertical switch (Downward) on

      OFF: Front vertical switch (Downward) off

      		 -
      Front Vertical Up Front vertical switch signal (Upward) / ON or OFF

      ON: Front vertical switch (Upward) on

      OFF: Front vertical switch (Upward) off

      		 -
      Lifter Switch Down Lifter switch signal (Downward) / ON or OFF

      ON: Lifter switch (Downward) on

      OFF: Lifter switch (Downward) off

      		 -
      Lifter Switch Up Lifter switch signal (Upward) / ON or OFF

      ON: Lifter switch (Upward) on

      OFF: Lifter switch (Upward) off

      		 -
      Slide Rear Sliding switch signal (Rearward) / ON or OFF

      ON: Sliding switch (Rearward) on

      OFF: Sliding switch (Rearward) off

      		 -
      Slide Front Sliding switch signal (Forward) / ON or OFF

      ON: Sliding switch (Forward) on

      OFF: Sliding switch (Forward) off

      		 -
      OK
      On intelligent tester screen, each item changes between ON and OFF according to above chart.

    NG

    INSPECT FRONT POWER SEAT SWITCH Click here

    OK

  4. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT POWER SEAT MOTOR)


    1. Using the intelligent tester, perform the Active Test.

      Driver Seat
      Tester Display Test Part Control Range Diagnostic Note
      Seat Reclining Seat reclining operation FRONT / OFF / REAR -
      Front Vertical Operation Seat front vertical operation UP / OFF / DOWN -
      Lifter Operation Seat lifter operation UP / OFF / DOWN -
      Seat Slide Operation Seat sliding operation FRONT / OFF / REAR -
      OK
      The power seat motors operate normally.

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    INSPECT POWER SEAT MOTOR ASSEMBLY Click here

  5. INSPECT FRONT POWER SEAT SWITCH

    B0040KQE01
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Component without harness connected

    (Power Seat Switch)
    *4 Reclining Switch
    *5 Sliding Switch
    *6 Front Vertical Switch
    *7 Lifter Switch

    1. Remove the power seat switch Click here.

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

      Standard Resistance
      Reclining Switch
      Tester Connection Switch Condition Specified Condition
      1 (E) - 3 (RCLF) Front Below 1 Ω
      2 (RCLR) - 3 (RCLF) Off Below 1 Ω
      1 (E) - 2 (RCLR) 10 kΩ or higher
      1 (E) - 3 (RCLF)
      1 (E) - 2 (RCLR) Rear Below 1 Ω
      Sliding Switch
      Tester Connection Switch Condition Specified Condition
      1 (E) - 9 (SLDF) Front Below 1 Ω
      6 (SLDR) - 9 (SLDF) Off Below 1 Ω
      1 (E) - 6 (SLDR) 10 kΩ or higher
      1 (E) - 9 (SLDF)
      1 (E) - 6 (SLDR) Rear Below 1 Ω
      Front Vertical Switch
      Tester Connection Switch Condition Specified Condition
      1 (E) - 10 (FUP)*1 Up Below 1 Ω
      1 (E) - 5 (FUP)*2
      5 (FDWN) - 10 (FUP)*1 Off Below 1 Ω
      5 (FUP) - 10 (FDWN)*2
      1 (E) - 5 (FDWN)*1 10 kΩ or higher
      1 (E) - 5 (FUP)*2
      1 (E) - 10 (FUP)*1
      1 (E) - 10 (FDWN)*2
      1 (E) - 5 (FDWN)*1 Down Below 1 Ω
      1 (E) - 10 (FDWN)*2
      Lifter Switch
      Tester Connection Switch Condition Specified Condition
      1 (E) - 7 (RUP)*1 Up Below 1 Ω
      1 (E) - 8 (RUP)*2
      7 (RUP) - 8 (RDWN)*1 Off Below 1 Ω
      7 (RDWN) - 8 (RUP)*2
      1 (E) - 7 (RUP)*1 10 kΩ or higher
      1 (E) - 8 (RUP)*2
      1 (E) - 8 (RDWN)*1
      1 (E) - 7 (RDWN)*2
      1 (E) - 8 (RDWN)*1 Down Below 1 Ω
      1 (E) - 7 (RDWN)*2

      • *1: for LHD

      • *2: for RHD


    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - POWER SEAT SWITCH)

    B0040KCE02
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Position Control ECU)
    *4

    Front view of wire harness connector

    (to Power Seat Switch)

    • *1: for LHD

    • *2: for RHD


    1. Disconnect the O26*1 or O16*2 ECU connector.

    2. Disconnect the O25*1 or O15*2 switch connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      O26-9 (SLDF) - O25-9 (SLDF) Always Below 1 Ω
      O26-10 (SLDR) - O25-6 (SLDR) Always Below 1 Ω
      O26-13 (FUP) - O25-10 (FUP) Always Below 1 Ω
      O26-14 (FDWN) - O25-5 (FDWN) Always Below 1 Ω
      O26-15 (LUP) - O25-7 (RUP) Always Below 1 Ω
      O26-16 (LDWN) - O25-8 (RDWN) Always Below 1 Ω
      O26-11 (RCLF) - O25-3 (RCLF) Always Below 1 Ω
      O26-12 (RCLR) - O25-2 (RCLR) Always Below 1 Ω
      O26-32 (SWE) - O25-1 (E) Always Below 1 Ω
      O26-9 (SLDF) - Body ground Always 10 kΩ or higher
      O26-10 (SLDR) - Body ground Always 10 kΩ or higher
      O26-13 (FUP) - Body ground Always 10 kΩ or higher
      O26-14 (FDWN) - Body ground Always 10 kΩ or higher
      O26-15 (LUP) - Body ground Always 10 kΩ or higher
      O26-16 (LDWN) - Body ground Always 10 kΩ or higher
      O26-11 (RCLF) - Body ground Always 10 kΩ or higher
      O26-12 (RCLR) - Body ground Always 10 kΩ or higher
      O26-32 (SWE) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      O16-9 (SLDF) - O15-9 (SLDF) Always Below 1 Ω
      O16-10 (SLDR) - O15-6 (SLDR) Always Below 1 Ω
      O16-13 (FUP) - O15-5 (FUP) Always Below 1 Ω
      O16-14 (FDWN) - O15-10 (FDWN) Always Below 1 Ω
      O16-15 (LUP) - O15-8 (RUP) Always Below 1 Ω
      O16-16 (LDWN) - O15-7 (RDWN) Always Below 1 Ω
      O16-11 (RCLF) - O15-3 (RCLF) Always Below 1 Ω
      O16-12 (RCLR) - O15-2 (RCLR) Always Below 1 Ω
      O16-32 (SWE) - O15-1 (E) Always Below 1 Ω
      O16-9 (SLDF) - Body ground Always 10 kΩ or higher
      O16-10 (SLDR) - Body ground Always 10 kΩ or higher
      O16-13 (FUP) - Body ground Always 10 kΩ or higher
      O16-14 (FDWN) - Body ground Always 10 kΩ or higher
      O16-15 (LUP) - Body ground Always 10 kΩ or higher
      O16-16 (LDWN) - Body ground Always 10 kΩ or higher
      O16-11 (RCLF) - Body ground Always 10 kΩ or higher
      O16-12 (RCLR) - Body ground Always 10 kΩ or higher
      O16-32 (SWE) - Body ground Always 10 kΩ or higher

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT POWER SEAT MOTOR ASSEMBLY


    1. B0040M6E01

      Check operation of the slide motor.


      1. Remove the power seat motor assembly (slide motor).

      2. Check if the seat adjuster moves smoothly when the battery is connected to the slide motor connector terminals.

        OK
        for LHD
        Measurement Condition Specified Condition

        Battery positive (+) → 3 (FWD)

        Battery negative (-) → 4 (BACK)

        		 Seat adjuster moves forward

        Battery positive (+) → 4 (BACK)

        Battery negative (-) → 3 (FWD)

        		 Seat adjuster moves backward
        for RHD
        Measurement Condition Specified Condition

        Battery positive (+) → 4 (FWD)

        Battery negative (-) → 3 (BACK)

        		 Seat adjuster moves forward

        Battery positive (+) → 3 (BACK)

        Battery negative (-) → 4 (FWD)

        		 Seat adjuster moves backward
    2. B0040N6E01

      Check operation of the front vertical motor.


      1. Remove the power seat motor assembly (front vertical motor) Click here.

      2. Check if the adjust screw rotates smoothly when the battery is connected to the front vertical motor connector terminals.

        OK
        for LHD
        Measurement Condition Specified Condition

        Battery positive (+) → 3 (UP)

        Battery negative (-) → 4 (DOWN)

        		 Adjust screw rotates clockwise

        Battery positive (+) → 4 (DOWN)

        Battery negative (-) → 3 (UP)

        		 Adjust screw rotates counterclockwise
        for RHD
        Measurement Condition Specified Condition

        Battery positive (+) → 4 (UP)

        Battery negative (-) → 3 (DOWN)

        		 Adjust screw rotates clockwise

        Battery positive (+) → 3 (DOWN)

        Battery negative (-) → 4 (UP)

        		 Adjust screw rotates counterclockwise
    3. B0040NDE01

      Check operation of the lifter motor.


      1. Remove the power seat motor assembly (lifter motor) Click here.

      2. Check if the motor gear rotates smoothly when the battery is connected to the lifter motor connector terminals.

        OK
        Measurement Condition Specified Condition

        Battery positive (+) → 3 (UP)

        Battery negative (-) → 6 (DOWN)

        		 Motor gear rotates clockwise

        Battery positive (+) → 6 (DOWN)

        Battery negative (-) → 3 (UP)

        		 Motor gear rotates counterclockwise
    4. B0040JCE01

      Check operation of the reclining motor.


      1. Remove the power seat motor assembly (reclining motor) Click here.

      2. Check if the motor gear rotates smoothly when the battery is connected to the reclining motor connector terminals.

        OK
        Measurement Condition Specified Condition

        Battery positive (+) → 4 (FWD)

        Battery negative (-) → 5 (BACK)

        		 Motor gear rotates clockwise

        Battery positive (+) → 5 (BACK)

        Battery negative (-) → 4 (FWD)

        		 Motor gear rotates counterclockwise
      Result
      Result Proceed to
      OK A
      NG (Slide motor) B
      NG (Front vertical motor) C
      NG (Lifter motor) D
      NG (Reclining motor) E

    B

    REPLACE POWER SEAT MOTOR ASSEMBLY (SLIDE MOTOR)

    C

    REPLACE POWER SEAT MOTOR ASSEMBLY (FRONT VERTICAL MOTOR) Click here

    D

    REPLACE POWER SEAT MOTOR ASSEMBLY (LIFTER MOTOR) Click here

    E

    REPLACE POWER SEAT MOTOR ASSEMBLY (RECLINING MOTOR) Click here

    A

  8. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU - POWER SEAT MOTOR)


    1. B0040NSE01
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Position Control ECU)
      *4

      Front view of wire harness connector

      (to Power Seat Motor)

      Check the slide motor.


      • *1: for LHD

      • *2: for RHD


      1. Disconnect the O27*1 or O17*2 ECU connector.

      2. Disconnect the O19*1 or O9*2 motor connector.

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

        Standard Resistance
        for LHD
        Tester Connection Condition Specified Condition
        O27-2 (SLD+) - O19-3 (FWD) Always Below 1 Ω
        O27-3 (SLD-) - O19-4 (BACK)
        O27-2 (SLD+) - Body ground Always 10 kΩ or higher
        O27-3 (SLD-) - Body ground
        for RHD
        Tester Connection Condition Specified Condition
        O17-2 (SLD+) - O9-4 (FWD) Always Below 1 Ω
        O17-3 (SLD-) - O9-3 (BACK)
        O17-2 (SLD+) - Body ground Always 10 kΩ or higher
        O17-3 (SLD-) - Body ground
    2. B0040NSE03
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Position Control ECU)
      *4

      Front view of wire harness connector

      (to Power Seat Motor)

      Check the front vertical motor.


      • *1: for LHD

      • *2: for RHD


      1. Disconnect the O27*1 or O17*2 ECU connector.

      2. Disconnect the O20*1 or O10*2 motor connector.

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

        Standard Resistance
        for LHD
        Tester Connection Condition Specified Condition
        O27-6 (FRV+) - O20-3 (UP) Always Below 1 Ω
        O27-4 (FRV-) - O20-4 (DOWN)
        O27-6 (FRV+) - Body ground Always 10 kΩ or higher
        O27-4 (FRV-) - Body ground
        for RHD
        Tester Connection Condition Specified Condition
        O17-6 (FRV+) - O10-4 (UP) Always Below 1 Ω
        O17-4 (FRV-) - O10-3 (DOWN)
        O17-6 (FRV+) - Body ground Always 10 kΩ or higher
        O17-4 (FRV-) - Body ground
    3. B0040NSE04
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Position Control ECU)
      *4

      Front view of wire harness connector

      (to Power Seat Motor)

      Check the lifter motor.


      • *1: for LHD

      • *2: for RHD


      1. Disconnect the O27*1 or O17*2 ECU connector.

      2. Disconnect the O21*1 or O11*2 motor connector.

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

        Standard Resistance
        for LHD
        Tester Connection Condition Specified Condition
        O27-7 (LFT+) - O21-3 (UP) Always Below 1 Ω
        O27-9 (LFT-) - O21-6 (DOWN)
        O27-7 (LFT+) - Body ground Always 10 kΩ or higher
        O27-9 (LFT-) - Body ground
        for RHD
        Tester Connection Condition Specified Condition
        O17-7 (LFT+) - O11-3 (UP) Always Below 1 Ω
        O17-9 (LFT-) - O11-6 (DOWN)
        O17-7 (LFT+) - Body ground Always 10 kΩ or higher
        O17-9 (LFT-) - Body ground
    4. B0040NSE05
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Position Control ECU)
      *4

      Front view of wire harness connector

      (to Power Seat Motor)

      Check the reclining motor.


      • *1: for LHD

      • *2: for RHD


      1. Disconnect the O27*1 or O17*2 ECU connector.

      2. Disconnect the O22*1 or O12*2 motor connector.

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

        Standard Resistance
        for LHD
        Tester Connection Condition Specified Condition
        O27-8 (RCL+) - O22-4 (FWD) Always Below 1 Ω
        O27-10 (RCL-) - O22-5 (BACK)
        O27-8 (RCL+) - Body ground Always 10 kΩ or higher
        O27-10 (RCL-) - Body ground
        for RHD
        Tester Connection Condition Specified Condition
        O17-8 (RCL+) - O12-4 (FWD) Always Below 1 Ω
        O17-10 (RCL-) - O12-5 (BACK)
        O17-8 (RCL+) - Body ground Always 10 kΩ or higher
        O17-10 (RCL-) - Body ground

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR