FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

Signals are input into the position control ECU assembly. The built-in ECU manages the signals received from the power seat switch and operates each motor. If the position control ECU assembly receives more than 2 motor operation signals for the same motor, the motor will be stopped. Manual operation resumes when the position control ECU assembly receives only 1 signal.

WIRING DIAGRAM


  1. B0088E8E01

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 front power seat switch (driver seat).

      Click here

      Result
      Result Proceed to
      All power seat functions do not operate A
      One or more power seat functions do not operate B

    B

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

    A

  2. INSPECT FRONT POWER SEAT SWITCH (DRIVER SEAT)


    1. Remove the front power seat switch (driver seat).

      Click here

    2. Inspect the front power seat switch (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH (DRIVER SEAT) Click here

    OK

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


    1. Disconnect the b23*1 and b25*1 or a10*2 and a12*2 position control ECU 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
      b23-3 (+B) - Body ground Always 11 to 14 V
      b25-15 (SYSB) - Body ground Always 11 to 14 V
      b25-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      b25-1 (IG) - Body ground Engine switch off Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      a10-3 (+B) - Body ground Always 11 to 14 V
      a12-15 (SYSB) - Body ground Always 11 to 14 V
      a12-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      a12-1 (IG) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      b25-12 (SENG) - b22-20 (E) Always Below 1 Ω
      b25-12 (SENG) or b22-20 (E) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      a12-12 (SENG) - a8-11 (E) Always Below 1 Ω
      a12-12 (SENG) or a8-11 (E) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU 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
      b23-2 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      a10-2 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR