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 assembly. The built-in ECU manages the signals received from the position control ECU assembly, and operates each motor. If the position control ECU assembly receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the position control ECU assembly receives 1 signal only.

WIRING DIAGRAM


  1. for Driver Seat:

    Figure 1. for LHD:

    B004SK6E03

    Figure 2. for RHD:

    B004SK6E04

  2. for Front Passenger Seat:

    Figure 3. for LHD:

    B004SK6E05

    Figure 4. for RHD:

    B004SK6E06

CAUTION / NOTICE / HINT

Note


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

  • Initializing the position control ECU assembly will clear the seat position memory.

Tech Tips


  • Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

  • Before initializing the seat ECU, make sure that the D/C CUT fuse is normal.

  • When any of the following conditions are met, the seat position Information in the position control ECU assembly will be cleared.


    • The power switch is turned off with any of the seat switches being operated and the D/C CUT fuse removed.

    • The power switch is turned off within 1 second of any of the seat switches being operated with the D/C CUT fuse removed.

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.

      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 (NO. 2 POSITION CONTROL ECU ASSEMBLY - BATTERY) 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 ASSEMBLY - BATTERY)


    1. for LHD:


      1. Disconnect the position control ECU assembly connectors.

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

        Standard Resistnace
        Tester Connection Condition Specified Condition
        Q28-1 (GND2) - Body ground Always Below 1 Ω
        Q28-2 (GND1) - Body ground Always Below 1 Ω
        Q28-17 (SYSB) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q27-2 (+B1) - Body ground Power switch off 11 to 14 V
        Q28-19 (IG) - Body ground Power switch on (IG) 11 to 14 V
        Power switch off Below 1 V

    2. for RHD:


      1. Disconnect the position control ECU assembly connectors.

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

        Standard Resistnace
        Tester Connection Condition Specified Condition
        Q8-1 (GND2) - Body ground Always Below 1 Ω
        Q8-2 (GND1) - Body ground Always Below 1 Ω
        Q8-17 (SYSB) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q7-2 (+B1) - Body ground Power switch off 11 to 14 V
        Q8-19 (IG) - Body ground Power switch on (IG) 11 to 14 V
        Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT FRONT POWER SEAT SWITCH


    1. Remove the front power seat switch.

      Click here

    2. Inspect the front power seat switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - BODY GROUND)


    1. for LHD:


      1. Disconnect the front power seat switch connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q29-20 (E) - Body ground Always Below 1 Ω

    2. for RHD:


      1. Disconnect the front power seat switch connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q9-11 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - BATTERY)


    1. for LHD:


      1. Disconnect the No. 2 position control ECU assembly RH connectors.

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

        Standard Resistnace
        Tester Connection Condition Specified Condition
        Q8-1 (GND2) - Body ground Always Below 1 Ω
        Q8-2 (GND1) - Body ground Always Below 1 Ω
        Q8-17 (SYSB) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q7-2 (+B1) - Body ground Power switch off 11 to 14 V
        Q8-19 (IG) - Body ground Power switch on (IG) 11 to 14 V
        Power switch off Below 1 V

    2. for RHD:


      1. Disconnect the No. 2 position control ECU assembly LH connectors.

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

        Standard Resistnace
        Tester Connection Condition Specified Condition
        Q28-1 (GND2) - Body ground Always Below 1 Ω
        Q28-2 (GND1) - Body ground Always Below 1 Ω
        Q28-17 (SYSB) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q27-2 (+B1) - Body ground Power switch off 11 to 14 V
        Q28-19 (IG) - Body ground Power switch on (IG) 11 to 14 V
        Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT FRONT POWER SEAT SWITCH


    1. Remove the front power seat switch.

      Click here

    2. Inspect the front power seat switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - BODY GROUND)


    1. for LHD:


      1. Disconnect the front power seat switch RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q9-11 (E) - Body ground Always Below 1 Ω

    2. for RHD:


      1. Disconnect the front power seat switch LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q29-20 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR