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

DESCRIPTION

Signals are input into the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat). The built-in ECU manages the signals received from the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat), and operates each motor. If the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat) receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the position control ECU and switch assembly (driver seat) or position control ECU and switch assembly (front passenger seat) receives 1 signal only.

WIRING DIAGRAM


  1. for Driver Seat

    B004GHHE12

  2. for Front Passenger Seat

    B004GHHE13

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the position control ECU and switch assembly (driver seat).

      Click here

      Result
      Result Proceed to
      All power seat functions do not operate (for Driver Seat) A
      All power seat functions do not operate (for Front Passenger Seat) B
      One or more power seat functions do not operate C

    B

    CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - POWER SUPPLY) Click here

    C

    GO TO OTHER DIAGNOSTIC PROCEDURE (One or more Power Seat Motors do not Operate) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - POWER SUPPLY)


    1. Disconnect the b4*1 and b5*1 or a4*2 and a5*2 position control ECU and switch assembly (driver seat) connectors.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      b4-7 (+B) - Body ground Power switch off 11 to 14 V
      b5-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      b5-3 (IG) - Body ground Power switch off Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      a4-7 (+B) - Body ground Power switch off 11 to 14 V
      a5-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      a5-3 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) - BODY GROUND)


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b4-2 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      a4-2 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) - POWER SUPPLY)


    1. Disconnect the a4*1 and a5*1 or b4*2 and b5*2 position control ECU and switch assembly (front passenger seat) connectors.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      a4-7 (+B) - Body ground Power switch off 11 to 14 V
      a5-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      a5-3 (IG) - Body ground Power switch off Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      b4-7 (+B) - Body ground Power switch off 11 to 14 V
      b5-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      b5-3 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      a4-2 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      b4-2 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (FRONT PASSENGER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR