REAR POWER SEAT CONTROL SYSTEM(for Third Row) Back Door Courtesy Switch Circuit

DESCRIPTION

Each fold seat control ECU receives back door courtesy light switch input signal to determine the state of the back door and enable or disable the fold and return functions.

WIRING DIAGRAM

B005O4WE03
*1 Back Door Lock Assembly
*2 Fold Seat Control ECU (RH Seat)
*3 Fold Seat Control ECU (LH Seat)

CAUTION / NOTICE / HINT

Note

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 BACK DOOR EASY CLOSER SYSTEM


    1. Check if the back door easy closer system operates normally.

      Click here

      OK
      Back door easy closer system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LIGHTING SYSTEM (BACK DOOR COURTESY SWITCH CIRCUIT) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU (RH/LH SEAT) - BACK DOOR LOCK ASSEMBLY)


    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 Z7 back door lock assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      k3-19 (BDCY) or m4-19 (BDCY) - Z7-8 (CTY) Always Below 1 Ω
      k3-19 (BDCY), m4-19 (BDCY) or Z7-8 (CTY) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK FOLD SEAT CONTROL ECU (RH SEAT)


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

    2. Disconnect the Z7 back door lock assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Z7-8 (CTY) - 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) - BACK DOOR LOCK ASSEMBLY)


    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
      k3-19 (BDCY) - Z7-8 (CTY) 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 Z7 back door lock assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Z7-8 (CTY) - 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) - BACK DOOR LOCK ASSEMBLY)


    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
      m4-19 (BDCY) - Z7-8 (CTY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FOLD SEAT SWITCH ASSEMBLY (LH SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR