REAR POWER SEAT CONTROL SYSTEM(for Third Row) Park / Neutral Position Switch Circuit

DESCRIPTION

Each fold seat control ECU receives the driving condition signal and engine switch signal from the main body ECU (multiplex network body ECU) to determine the driving state of the vehicle and enable or disable the fold and return functions.

WIRING DIAGRAM

B005OD7E06
*1 SFTP
*2 Main Body ECU (Multiplex Network Body ECU)
*3 Fold Seat Control ECU (RH Seat)
*4 Fold Seat Control ECU (LH Seat)

CAUTION / NOTICE / HINT

Note


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

  • When a fold seat control ECU (RH/LH seat) is replaced, it is necessary to perform initialization.

    Click here

PROCEDURE


  1. CHECK REAR POWER SEAT CONTROL SYSTEM (for Third Row)


    1. Check that the rear power seat control system (for Third Row) function operates normally.

      Result
      Result Proceed to
      Fold/Return functions of both rear No. 2 power seats do not operate normally. A
      Fold/Return functions of rear No. 2 power seat RH do not operate normally. B
      Fold/Return functions of rear No. 2 power seat LH do not operate normally. C

    B

    CHECK FOLD SEAT CONTROL ECU (RH SEAT) Click here

    C

    CHECK FOLD SEAT CONTROL ECU (LH SEAT) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH/LH SEAT) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the k3 fold seat control ECU (RH seat) connector.

    2. Disconnect the m4 fold seat control ECU (LH seat) connector.

    3. Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      k3-17 (P) or m4-17 (P) - J9-16 (SFTP) Always Below 1 Ω
      k3-17 (P), m4-17 (P) or J9-16 (SFTP) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Reconnect the k3 fold seat control ECU (RH seat) connector.

    2. Reconnect the m4 fold seat control ECU (LH seat) connector.

    3. Reconnect the J9 main body ECU (multiplex network body ECU) connector.

    4. B005P8JC05
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J9-16 (SFTP) - Body ground

      Any of the following conditions are met:


      • Engine switch off

      • Engine switch on (IG) and vehicle speed 5 km/h (3.1 mph) or more

      • Engine switch on (IG), shift lever not in P, brake pedal not depressed and parking brake released

      		 11 to 14 V

      Engine switch is on (IG) and any of the following conditions are met:


      • Vehicle speed below 5 km/h (3.1 mph) and shift lever in P

      • Vehicle speed below 5 km/h (3.1 mph) and brake pedal depressed

      • Vehicle speed below 5 km/h (3.1 mph) and parking brake applied

      		 Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

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

  4. CHECK FOLD SEAT CONTROL ECU (RH SEAT)


    1. Disconnect the m4 fold seat control ECU (LH seat) connector.

    2. Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J9-16 (SFTP) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH SEAT) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the k3 fold seat control ECU (RH seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      k3-17 (P) - J9-16 (SFTP) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FOLD SEAT CONTROL ECU (RH SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK FOLD SEAT CONTROL ECU (LH SEAT)


    1. Disconnect the k3 fold seat control ECU (RH seat) connector.

    2. Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J9-16 (SFTP) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (LH SEAT) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the m4 fold seat control ECU (LH seat) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      m4-17 (P) - J9-16 (SFTP) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FOLD SEAT CONTROL ECU (LH SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR