FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) One or more Power Seat Motors do not Operate

DESCRIPTION

Signals are input into the front power seat switch LH. The built-in ECU manages the signals received from the front power seat switch LH, and operates each motor. If the front power seat switch LH receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the front power seat switch LH receives 1 signal only.

WIRING DIAGRAM

A01MH5XE22
A01MHOYE11
for LHD
*a Front Power Seat Switch LH
*b Front Lumbar Power Seat Switch
*c Lumbar Support Adjuster Assembly LH
A01MH5XE23
A01MHOYE12
for RHD
*a Front Power Seat Switch RH
*b Front Lumbar Power Seat Switch
*c Lumbar Support Adjuster Assembly RH

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check Vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK FRONT POWER SEAT OPERATION Click here

    A

  2. CHECK FRONT POWER SEAT OPERATION


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

      Click here

      Result
      Result Proceed to
      One or more power seat functions (except lumbar support adjustment function) do not operate A
      All power seat functions do not operate B
      Front vertical and lifter functions do not operate C
      Only lumbar support adjustment function does not operate D

    B

    GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) Click here

    C

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - AUXILIARY BATTERY) Click here

    D

    INSPECT FRONT LUMBAR POWER SEAT SWITCH Click here

    A

  3. READ VALUE USING GTS (POWER SEAT SWITCH)


    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
      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 Slide switch signal (Rearward) ON or OFF

      ON: Slide switch (Rearward) on

      OFF: Slide switch (Rearward) off

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

      ON: Slide switch (Forward) on

      OFF: Slide switch (Forward) off

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Reclining Rear
      Reclining Front
      Front Vertical Down
      Front Vertical Up
      Lifter Switch Down
      Lifter Switch Up
      Slide Rear
      Slide Front
      OK
      ON or OFF is displayed on the Techstream according to the table above.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    OK

  4. PERFORM ACTIVE TEST USING GTS (POWER SEAT MOTOR)


    1. Enter the following menus: Body Electrical / Driver Seat / Active Test.

    2. Perform the Active Test according to the display on the GTS.


      Body Electrical > Driver Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -
      Front Vertical Operation Seat front vertical operation OFF/Down/Up -
      Lifter Operation Seat lifter operation OFF/Down/Up -
      Seat Slide Operation Seat slide operation OFF/Rear/Front -

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Reclining

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Front Vertical Operation

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Lifter Operation

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Slide Operation
      Result
      Result Proceed to
      The power seat functions operate normally. A
      Slide, front vertical or lifter function does not operate normally. B
      Reclining function does not operate normally. C

    A

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    C

    INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT) Click here

    B

  5. INSPECT FRONT SEAT ADJUSTER ASSEMBLY LH

    Tech Tips

    Check the motor operation of applicable function.


    1. Remove the front seat adjuster assembly LH.

      Click here

    2. Inspect the front seat adjuster assembly LH (slide motor, front vertical motor or lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 7 Click here

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY LH Click here

  6. INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT)


    1. Remove the separate type front seatback spring assembly (driver seat).

      Click here

    2. Inspect the separate type front seatback spring assembly (driver seat) (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SEAT MOTOR)


    1. Disconnect the a9 front power seat switch LH connector.

    2. Disconnect the a8 slide motor connector.

    3. Disconnect the a2 front vertical motor connector.

    4. Disconnect the a3 lifter motor connector.

    5. Disconnect the c1 reclining motor connector.

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

      Tech Tips

      Check the wire harness and connector between the front power seat switch LH and applicable motor.

      Standard Resistance
      Tester Connection Condition Specified Condition
      a9-3 (SLD+) - a8-4 (FWD) Always Below 1 Ω
      a9-3 (SLD+) - Body ground Always 10 kΩ or higher
      a8-4 (FWD) - Body ground Always 10 kΩ or higher
      a9-4 (SLD-) - a8-1 (BACK) Always Below 1 Ω
      a9-4 (SLD-) - Body ground Always 10 kΩ or higher
      a8-1 (BACK) - Body ground Always 10 kΩ or higher
      a9-5 (FRV-) - a2-1 Always Below 1 Ω
      a9-5 (FRV-) - Body ground Always 10 kΩ or higher
      a2-1 - Body ground Always 10 kΩ or higher
      a9-8 (FRV+) - a2-2 Always Below 1 Ω
      a9-8 (FRV+) - Body ground Always 10 kΩ or higher
      a2-2 - Body ground Always 10 kΩ or higher
      a9-10 (LFT+) - a3-2 Always Below 1 Ω
      a9-10 (LFT+) - Body ground Always 10 kΩ or higher
      a3-2 - Body ground Always 10 kΩ or higher
      a9-12 (LFT-) - a3-1 Always Below 1 Ω
      a9-12 (LFT-) - Body ground Always 10 kΩ or higher
      a3-1 - Body ground Always 10 kΩ or higher
      a9-9 (RCL+) - c1-2 Always Below 1 Ω
      a9-9 (RCL+) - Body ground Always 10 kΩ or higher
      c1-2 - Body ground Always 10 kΩ or higher
      a9-11 (RCL-) - c1-1 Always Below 1 Ω
      a9-11 (RCL-) - Body ground Always 10 kΩ or higher
      c1-1 - 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

  8. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - AUXILIARY BATTERY)


    1. A01MG8XC04
      *a

      Front view of wire harness connector

      (to Front Power Seat Switch LH)

      Disconnect the front power seat switch LH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      a10-12 (SYSB) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  9. INSPECT FRONT LUMBAR POWER SEAT SWITCH


    1. Remove the front lumbar power seat switch.

      Click here

    2. Inspect the front lumbar power seat switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT LUMBAR POWER SEAT SWITCH Click here

    OK

  10. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY LH


    1. Remove the lumbar support adjuster assembly LH.

      Click here

    2. Inspect the lumbar support adjuster assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY LH Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - FRONT LUMBAR POWER SEAT SWITCH)


    1. Disconnect the a9 front power seat switch LH connector.

    2. Disconnect the a5 front lumbar power seat switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a9-6 (+B2) - a5-5 (B) Always Below 1 Ω
      a9-6 (+B2) - Body ground Always 10 kΩ or higher
      a5-5 (B) - Body ground Always 10 kΩ or higher
      a9-1 (GND2) - a5-2 (E2) Always Below 1 Ω
      a9-1 (GND2) - Body ground Always 10 kΩ or higher
      a5-2 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (FRONT LUMBAR POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY LH)


    1. Disconnect the a5 front lumbar power seat switch connector.

    2. Disconnect the c2 lumbar support adjuster assembly LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a5-1 (R) - c2-2 Always Below 1 Ω
      a5-1 (R) - Body ground Always 10 kΩ or higher
      c2-2 - Body ground Always 10 kΩ or higher
      a5-3 (H) - c2-1 Always Below 1 Ω
      a5-3 (H) - Body ground Always 10 kΩ or higher
      c2-1 - 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. CHECK FRONT POWER SEAT OPERATION


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

      Click here

      Result
      Result Proceed to
      One or more power seat functions (except lumbar support adjustment function) do not operate A
      All power seat functions do not operate B
      Front vertical and lifter functions do not operate C
      Only lumbar support adjustment function does not operate D

    B

    GO TO OTHER DIAGNOSIS PROCEDURE (Front Power Seat does not Operate with Front Power Seat Switch) Click here

    C

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - AUXILIARY BATTERY) Click here

    D

    INSPECT FRONT LUMBAR POWER SEAT SWITCH Click here

    A

  14. READ VALUE USING GTS (POWER SEAT SWITCH)


    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
      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 Slide switch signal (Rearward) ON or OFF

      ON: Slide switch (Rearward) on

      OFF: Slide switch (Rearward) off

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

      ON: Slide switch (Forward) on

      OFF: Slide switch (Forward) off

      		 -

      Body Electrical > Driver Seat > Data List
      Tester Display
      Reclining Rear
      Reclining Front
      Front Vertical Down
      Front Vertical Up
      Lifter Switch Down
      Lifter Switch Up
      Slide Rear
      Slide Front
      OK
      ON or OFF is displayed on the Techstream according to the table above.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    OK

  15. PERFORM ACTIVE TEST USING GTS (POWER SEAT MOTOR)


    1. Enter the following menus: Body Electrical / Driver Seat / Active Test.

    2. Perform the Active Test according to the display on the GTS.


      Body Electrical > Driver Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -
      Front Vertical Operation Seat front vertical operation OFF/Down/Up -
      Lifter Operation Seat lifter operation OFF/Down/Up -
      Seat Slide Operation Seat slide operation OFF/Rear/Front -

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Reclining

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Front Vertical Operation

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Lifter Operation

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Seat Slide Operation
      Result
      Result Proceed to
      The power seat functions operate normally. A
      Slide, front vertical or lifter function does not operate normally. B
      Reclining function does not operate normally. C

    A

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    C

    INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT) Click here

    B

  16. INSPECT FRONT SEAT ADJUSTER ASSEMBLY RH

    Tech Tips

    Check the motor operation of applicable function.


    1. Remove the front seat adjuster assembly RH.

      Click here

    2. Inspect the front seat adjuster assembly RH (slide motor, front vertical motor or lifter motor).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 18 Click here

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY RH Click here

  17. INSPECT SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT)


    1. Remove the separate type front seatback spring assembly (driver seat).

      Click here

    2. Inspect the separate type front seatback spring assembly (driver seat) (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY (DRIVER SEAT) Click here

    OK

  18. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SEAT MOTOR)


    1. Disconnect the Z4 front power seat switch RH connector.

    2. Disconnect the Z1 slide motor connector.

    3. Disconnect the Z2 front vertical motor connector.

    4. Disconnect the Z3 lifter motor connector.

    5. Disconnect the b1 reclining motor connector.

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

      Tech Tips

      Check the wire harness and connector between the front power seat switch LH and applicable motor.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z4-3 (SLD+) - Z1-4 (FWD) Always Below 1 Ω
      Z4-3 (SLD+) - Body ground Always 10 kΩ or higher
      Z1-4 (FWD) - Body ground Always 10 kΩ or higher
      Z4-4 (SLD-) - Z1-1 (BACK) Always Below 1 Ω
      Z4-4 (SLD-) - Body ground Always 10 kΩ or higher
      Z1-1 (BACK) - Body ground Always 10 kΩ or higher
      Z4-5 (FRV-) - Z2-1 Always Below 1 Ω
      Z4-5 (FRV-) - Body ground Always 10 kΩ or higher
      Z2-1 - Body ground Always 10 kΩ or higher
      Z4-8 (FRV+) - Z2-2 Always Below 1 Ω
      Z4-8 (FRV+) - Body ground Always 10 kΩ or higher
      Z2-2 - Body ground Always 10 kΩ or higher
      Z4-10 (LFT+) - Z3-2 Always Below 1 Ω
      Z4-10 (LFT+) - Body ground Always 10 kΩ or higher
      Z3-2 - Body ground Always 10 kΩ or higher
      Z4-12 (LFT-) - Z3-1 Always Below 1 Ω
      Z4-12 (LFT-) - Body ground Always 10 kΩ or higher
      Z3-1 - Body ground Always 10 kΩ or higher
      Z4-9 (RCL+) - b1-2 Always Below 1 Ω
      Z4-9 (RCL+) - Body ground Always 10 kΩ or higher
      b1-2 - Body ground Always 10 kΩ or higher
      Z4-11 (RCL-) - b1-1 Always Below 1 Ω
      Z4-11 (RCL-) - Body ground Always 10 kΩ or higher
      b1-1 - 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

  19. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - AUXILIARY BATTERY)


    1. A01MG8XC05
      *a

      Front view of wire harness connector

      (to Front Power Seat Switch RH)

      Disconnect the front power seat switch RH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Z5-12 (SYSB) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  20. INSPECT FRONT LUMBAR POWER SEAT SWITCH


    1. Remove the front lumbar power seat switch.

      Click here

    2. Inspect the front lumbar power seat switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT LUMBAR POWER SEAT SWITCH Click here

    OK

  21. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY LH


    1. Remove the lumbar support adjuster assembly RH.

      Click here

    2. Inspect the lumbar support adjuster assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUMBAR SUPPORT ADJUSTER ASSEMBLY RH Click here

    OK

  22. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - FRONT LUMBAR POWER SEAT SWITCH)


    1. Disconnect the Z4 front power seat switch RH connector.

    2. Disconnect the Z6 front lumbar power seat switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z4-6 (+B2) - Z6-5 (B) Always Below 1 Ω
      Z4-6 (+B2) - Body ground Always 10 kΩ or higher
      Z6-5 (B) - Body ground Always 10 kΩ or higher
      Z4-1 (GND2) - Z6-2 (E2) Always Below 1 Ω
      Z4-1 (GND2) - Body ground Always 10 kΩ or higher
      Z6-2 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  23. CHECK HARNESS AND CONNECTOR (FRONT LUMBAR POWER SEAT SWITCH - LUMBAR SUPPORT ADJUSTER ASSEMBLY RH)


    1. Disconnect the Z6 front lumbar power seat switch connector.

    2. Disconnect the b2 lumbar support adjuster assembly RH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z6-3 (R) - b2-2 Always Below 1 Ω
      Z6-3 (R) - Body ground Always 10 kΩ or higher
      b2-2 - Body ground Always 10 kΩ or higher
      Z6-1 (H) - b2-1 Always Below 1 Ω
      Z6-1 (H) - Body ground Always 10 kΩ or higher
      b2-1 - 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