REAR POWER SEAT CONTROL SYSTEM (w/ Memory) Power Seat Position is not Memorized or does not Return to Memorized Position

DESCRIPTION

When the M1 switch, M2 switch or return switch of the rear power seat switch (for rear right seat) is pressed while the SET switch is being pressed, or when the M1 switch, M2 switch or return switch is pressed within 3 seconds of pressing the SET switch, the position control ECU assembly (for rear right seat) memorizes the position of the motors. When the M1 switch, M2 switch or return switch is pressed, the position control ECU assembly (for rear right seat) operates each motor based on the respective memorized position.

WIRING DIAGRAM


  1. for Rear Right Seat

    A01CGB6E01

  2. for Rear Left Seat

    A01CGB6E03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK REAR POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the rear power seat switch Click here.

      OK
      Each function of the power seat operates normally using the rear power seat switch.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION


    1. Check that the seat position memory and restoring functions operate properly Click here.

      Result
      Result Proceed to
      Seat position memory and restoring functions do not operate properly (for Rear Right Seat) A
      Seat position memory and restoring functions do not operate properly (for Rear Left Seat) B

    B

    CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION (FOR REAR LEFT SEAT) Click here

    A

  3. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION (FOR REAR RIGHT SEAT)


    1. Seat position memory and restoring functions do not operate properly Click here.

      Result
      Result Proceed to
      Seat position memory and restoring functions of both reclining and ottoman functions do not operate properly A
      Seat position memory and restoring functions of the reclining function do not operate properly B
      Seat position memory and restoring functions of the ottoman function do not operate properly C

    B

    CHECK HARNESS AND CONNECTOR (RECLINING MOTOR - POSITION CONTROL ECU ASSEMBLY) Click here

    C

    CHECK HARNESS AND CONNECTOR (OTTOMAN MOTOR - POSITION CONTROL ECU ASSEMBLY) Click here

    A

  4. INSPECT REAR POWER SEAT SWITCH (FOR REAR RIGHT SEAT)


    1. A01CDW5E01
      Text in Illustration
      *a

      Component without harness connected

      (Rear Power Seat Switch (for Rear Right Seat))

      Remove the rear power seat switch (for rear right seat) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      14 - 22 SET switch pressed and held Below 1 Ω
      15 - 22 M1 switch pressed and held Below 1 Ω
      16 - 22 M2 switch pressed and held Below 1 Ω
      17 - 22 Return switch pressed and held Below 1 Ω

    NG

    REPLACE REAR POWER SEAT SWITCH (REAR RIGHT SEAT) Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT SWITCH - POSITION CONTROL ECU ASSEMBLY - BODY GROUND)


    1. Disconnect the X8 and X9 position control ECU assembly (for rear right seat) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X6-14 (RMRY) - X9-5 (RMSS) Always Below 1 Ω
      X6-14 (RMRY) - Body ground Always 10 kΩ or higher
      X6-15 (RM1) - X9-37 (RMS1) Always Below 1 Ω
      X6-15 (RM1) - Body ground Always 10 kΩ or higher
      X6-16 (RM2) - X9-38 (RMS2) Always Below 1 Ω
      X6-16 (RM2) - Body ground Always 10 kΩ or higher
      X6-17 (RM3) - X9-14 (RTNS) Always Below 1 Ω
      X6-17 (RM3) - Body ground Always 10 kΩ or higher
      X6-22 (RGND) - X9-17 (SSWE) Always Below 1 Ω
      X6-22 (RGND) - Body ground Always 10 kΩ or higher
      X8-8 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) Click here

  6. CHECK HARNESS AND CONNECTOR (RECLINING MOTOR - POSITION CONTROL ECU ASSEMBLY)


    1. Disconnect the P5 reclining motor (No. 1 seat back frame sub-assembly RH) connector.

    2. Disconnect the X9 position control ECU assembly (for rear right seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P5-2 (RSSR) - X9-22 (RSRR) Always Below 1 Ω
      P5-2 (RSSR) - Body ground Always 10 kΩ or higher
      P5-5 (RSRV) - X9-25 (RSRV) Always Below 1 Ω
      P5-5 (RSRV) - Body ground Always 10 kΩ or higher
      P5-6 (RSRG) - X9-36 (RSRG) Always Below 1 Ω
      P5-6 (RSRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  7. CHECK POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) (RECLINING MOTOR CIRCUIT)


    1. Reconnect the X9 position control ECU assembly (for rear right seat) connector.

      A01CBR9E01
      Text in Illustration
      *a

      Component with harness connected

      (Position Control ECU Assembly (for Rear Right Seat))

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X9-25 (RSRV) - X9-36 (RSRG) Reclining switch on 4.8 V or more

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) Click here

    OK

  8. CHECK RECLINING MOTOR (NO. 1 SEAT BACK FRAME SUB-ASSEMBLY RH)


    1. A01CFZ7E01
      Text in Illustration
      *a

      Component with harness connected

      (Reclining Motor (No. 1 Seat Back Frame Sub-assembly RH))

      Reconnect the P5 reclining motor (No. 1 seat back frame sub-assembly RH) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P5-2 (RSSR) - Body ground Reclining switch on

      Pulse generation

      (0.4 V or less ← → 4.6 V or more)

    NG

    REPLACE NO.1 SEAT BACK FRAME SUB-ASSEMBLY RH Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) Click here

  9. CHECK HARNESS AND CONNECTOR (OTTOMAN MOTOR - POSITION CONTROL ECU ASSEMBLY)


    1. Disconnect the X5 ottoman motor (rear reclining adjuster arm sub-assembly lower inner RH) connector.

    2. Disconnect the X9 position control ECU assembly (for rear right seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X5-2 (OSRB) - X9-23 (OSRB) Always Below 1 Ω
      X5-2 (OSRB) - Body ground Always 10 kΩ or higher
      X5-5 (OSRV) - X9-24 (OSRV) Always Below 1 Ω
      X5-5 (OSRV) - Body ground Always 10 kΩ or higher
      X5-6 (OSRG) - X9-30 (OSRG) Always Below 1 Ω
      X5-6 (OSRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  10. CHECK POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) (OTTOMAN MOTOR CIRCUIT)


    1. Reconnect the X9 position control ECU assembly (for rear right seat) connector.

      A01CBR9E02
      Text in Illustration
      *a

      Component with harness connected

      (Position Control ECU Assembly (for Rear Right Seat))

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X9-24 (OSRV) - X9-30 (OSRG) Reclining switch on 4.8 V or more

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) Click here

    OK

  11. CHECK OTTOMAN MOTOR (REAR RECLINING ADJUSTER ARM SUB-ASSEMBLY LOWER INNER RH)


    1. A01CFZ7E02
      Text in Illustration
      *a

      Component with harness connected

      (Ottoman Motor (Rear Reclining Adjuster Arm Sub-assembly Lower Inner RH))

      Reconnect the X5 ottoman motor (rear reclining adjuster arm sub-assembly lower inner RH) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      X5-2 (OSRB) - Body ground Reclining switch on

      Pulse generation

      (0.4 V or less ← → 4.6 V or more)

    NG

    REPLACE REAR RECLINING ADJUSTER ARM SUB-ASSEMBLY LOWER INNER RH Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR RIGHT SEAT) Click here

  12. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION (FOR REAR LEFT SEAT)


    1. Check that the seat position memory and restoring functions operate properly Click here.

      Result
      Result Proceed to
      Seat position memory and restoring functions of both reclining and ottoman functions do not operate properly A
      Seat position memory and restoring functions of the reclining function do not operate properly B
      Seat position memory and restoring functions of the ottoman function do not operate properly C

    B

    CHECK HARNESS AND CONNECTOR (RECLINING MOTOR - POSITION CONTROL ECU ASSEMBLY) Click here

    C

    CHECK HARNESS AND CONNECTOR (OTTOMAN MOTOR - POSITION CONTROL ECU ASSEMBLY) Click here

    A

  13. INSPECT REAR POWER SEAT SWITCH (FOR REAR LEFT SEAT)


    1. A01CDW5E01
      Text in Illustration
      *a

      Component without harness connected

      (Rear Power Seat Switch (for Rear Left Seat))

      Remove the rear power seat switch (for rear left seat) Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      14 - 22 SET switch pressed and held Below 1 Ω
      15 - 22 M1 switch pressed and held Below 1 Ω
      16 - 22 M2 switch pressed and held Below 1 Ω
      17 - 22 Return switch pressed and held Below 1 Ω

    NG

    REPLACE REAR POWER SEAT SWITCH (FOR REAR LEFT SEAT) Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT SWITCH - POSITION CONTROL ECU ASSEMBLY - BODY GROUND)


    1. Disconnect the Y8 and Y9 position control ECU assembly (for rear left seat) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y6-14 (LMRY) - Y9-5 (RMSS) Always Below 1 Ω
      Y6-14 (LMRY) - Body ground Always 10 kΩ or higher
      Y6-15 (LM1) - Y9-37 (RMS1) Always Below 1 Ω
      Y6-15 (LM1) - Body ground Always 10 kΩ or higher
      Y6-16 (LM2) - Y9-38 (RMS2) Always Below 1 Ω
      Y6-16 (LM2) - Body ground Always 10 kΩ or higher
      Y6-17 (LM3) - Y9-14 (RTNS) Always Below 1 Ω
      Y6-17 (LM3) - Body ground Always 10 kΩ or higher
      Y6-22 (LGND) - Y9-17 (SSWE) Always Below 1 Ω
      Y6-22 (LGND) - Body ground Always 10 kΩ or higher
      Y8-8(GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT) Click here

  15. CHECK HARNESS AND CONNECTOR (RECLINING MOTOR - POSITION CONTROL ECU ASSEMBLY)


    1. Disconnect the Q4 reclining motor (No. 1 seat back frame sub-assembly LH) connector.

    2. Disconnect the Y9 position control ECU assembly (for rear left seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q4-2 (RSSR) - Y9-22 (RSRR) Always Below 1 Ω
      Q4-2 (RSSR) - Body ground Always 10 kΩ or higher
      Q4-5 (RSRV) - Y9-25 (RSRV) Always Below 1 Ω
      Q4-5 (RSRV) - Body ground Always 10 kΩ or higher
      Q4-6 (RSRG) - Y9-36 (RSRG) Always Below 1 Ω
      Q4-6 (RSRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  16. CHECK POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT) (RECLINING MOTOR CIRCUIT)


    1. Reconnect the Y9 position control ECU assembly (for rear left seat) connector.

      A01CBR9E03
      Text in Illustration
      *a

      Component with harness connected

      (Position Control ECU Assembly (for Rear Left Seat))

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Y9-25 (RSRV) - Y9-36 (RSRG) Reclining switch on 4.8 V or more

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT) Click here

    OK

  17. CHECK RECLINING MOTOR (NO. 1 SEAT BACK FRAME SUB-ASSEMBLY LH)


    1. A01CFZ7E05
      Text in Illustration
      *a

      Component with harness connected

      (Reclining Motor (No. 1 Seat Back Frame Sub-assembly LH))

      Reconnect the Q4 reclining motor (No. 1 seat back frame sub-assembly LH) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q4-2 (RSSR) - Body ground Reclining switch on

      Pulse generation

      (0.4 V or less ← → 4.6 V or more)

    NG

    REPLACE NO. 1 SEAT BACK FRAME SUB-ASSEMBLY LH Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT) Click here

  18. CHECK HARNESS AND CONNECTOR (OTTOMAN MOTOR - POSITION CONTROL ECU ASSEMBLY)


    1. Disconnect the Y5 ottoman motor (rear reclining adjuster arm sub-assembly lower inner LH) connector.

    2. Disconnect the Y9 position control ECU assembly (for rear left seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Y5-2 (OSRB) - Y9-23 (OSRB) Always Below 1 Ω
      Y5-2 (OSRB) - Body ground Always 10 kΩ or higher
      Y5-5 (OSRV) - Y9-24 (OSRV) Always Below 1 Ω
      Y5-5 (OSRV) - Body ground Always 10 kΩ or higher
      Y5-6 (OSRG) - Y9-30 (OSRG) Always Below 1 Ω
      Y5-6 (OSRG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  19. CHECK POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT)


    1. Reconnect the Y9 position control ECU assembly (for rear left seat) connector.

      A01CBR9E04
      Text in Illustration
      *a

      Component with harness connected

      (Position Control ECU Assembly (for Rear Left Seat))

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Y9-24 (OSRV) - Y9-30 (OSRG) Reclining switch on 4.8 V or more

    NG

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT) Click here

    OK

  20. CHECK OTTOMAN MOTOR (REAR RECLINING ADJUSTER ARM SUB-ASSEMBLY LOWER INNER LH)


    1. A01CFZ7E04
      Text in Illustration
      *a

      Component with harness connected

      (Ottoman Motor (Rear Reclining Adjuster Arm Sub-assembly Lower Inner LH))

      Reconnect the Y5 ottoman motor (rear reclining adjuster arm sub-assembly lower inner LH) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Y5-2 (OSRB) - Body ground Reclining switch on

      Pulse generation

      (0.4 V or less ← → 4.6 V or more)

    NG

    REPLACE REAR RECLINING ADJUSTER ARM SUB-ASSEMBLY LOWER INNER LH Click here

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (FOR REAR LEFT SEAT) Click here