FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2652

DTC Code DTC Name
B2652 Front Vertical Sensor Malfunction

DESCRIPTION

When the position control ECU assembly does not receive a sensor signal despite upward or downward movement of the seat cushion by power seat motor operation, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2652 Front Vertical Sensor Malfunction The upward and downward lock detection position of the sensor is the same.

  • Position control ECU assembly

  • No. 2 position control ECU assembly

  • Front seat adjuster assembly LH (front tilt motor)

  • Front seat adjuster assembly RH (front tilt motor)

  • Harness or connector

WIRING DIAGRAM


  1. for Driver Seat:

    Figure 1. for LHD:

    B006AMTE14
    *a Front Tilt Motor
    *b Position Control ECU Assembly
    *c Front Seat Adjuster Assembly LH

    Figure 2. for RHD:

    B006AMTE15
    *a Front Tilt Motor
    *b Position Control ECU Assembly
    *c Front Seat Adjuster Assembly RH

  2. for Front Passenger Seat:

    Figure 3. for LHD:

    B006AMTE16
    *a Front Tilt Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seat Adjuster Assembly RH

    Figure 4. for RHD:

    B006AMTE17
    *a Front Tilt Motor
    *b No. 2 Position Control ECU Assembly
    *c Front Seat Adjuster Assembly LH

CAUTION / NOTICE / HINT

Note

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

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Driver Seat > Clear DTCs
      Body Electrical > Passenger Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Driver Seat > Trouble Codes
      Body Electrical > Passenger Seat > Trouble Codes
      OK
      DTC B2652 is not output.
      Result
      Result Proceed to
      DTC B2652 is not output A
      DTC B2652 output from "Driver Seat" B
      DTC B2652 output from "Front Passenger Seat" C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    PERFORM ACTIVE TEST USING GTS (FRONT VERTICAL OPERATION) Click here

    B

  3. PERFORM ACTIVE TEST USING GTS (FRONT VERTICAL OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Driver Seat / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Driver Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Front Vertical Operation Seat front vertical operation OFF/Down/Up -

      Body Electrical > Driver Seat > Active Test
      Tester Display
      Front Vertical Operation
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

  4. CHECK POSITION CONTROL ECU ASSEMBLY (FRONT TILT MOTOR CIRCUIT)


    1. for LHD:


      1. Disconnect the front seatback frame sub-assembly LH (front tilt motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q23-2 - Q23-3 Tilt switch on 4.8 to 5.1 V

    2. fro RHD:


      1. Disconnect the front seatback frame sub-assembly RH (front tilt motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q2-2 - Q2-3 Tilt switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (FRONT TILT MOTOR))


    1. for LHD:


      1. Disconnect the Q28 position control ECU assembly connector.

      2. Disconnect the Q23 front seat adjuster assembly LH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q28-25 (SSFV) - Q23-2 Always Below 1 Ω
        Q28-25 (SSFV) or Q23-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q23-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q8 position control ECU assembly connector.

      2. Disconnect the Q2 front seat adjuster assembly RH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q8-25 (SSFV) - Q2-2 Always Below 1 Ω
        Q8-25 (SSFV) or Q2-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q2-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT FRONT SEAT ADJUSTER ASSEMBLY


    1. Remove the front seat adjuster assembly (front tilt motor).

      Click here

    2. Inspect the front seat adjuster assembly (front tilt motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (FRONT TILT MOTOR))


    1. for LHD:


      1. Disconnect the Q26 position control ECU assembly connectors.

      2. Disconnect the Q23 front seat adjuster assembly LH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q26-7 (FRV+) - Q23-1 Always Below 1 Ω
        Q26-7 (FRV+) or Q23-1 - Other terminals and body ground Always 10 kΩ or higher
        Q26-6 (FRV-) - Q23-4 Always Below 1 Ω
        Q26-6 (FRV-) or Q23-4 - Other terminals and body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the Q6 position control ECU assembly connectors.

      2. Disconnect the Q2 front seat adjuster assembly RH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q6-7 (FRV+) - Q2-1 Always Below 1 Ω
        Q6-7 (FRV+) or Q2-1 - Other terminals and body ground Always 10 kΩ or higher
        Q6-6 (FRV-) - Q2-4 Always Below 1 Ω
        Q6-6 (FRV-) or Q2-4 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. PERFORM ACTIVE TEST USING GTS (FRONT VERTICAL OPERATION)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Passenger Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Front Vertical Operation Seat front vertical operation OFF/Down/Up -

      Body Electrical > Passenger Seat > Active Test
      Tester Display
      Front Vertical Operation
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

  9. CHECK NO. 2 POSITION CONTROL ECU ASSEMBLY (FRONT TILT MOTOR CIRCUIT)


    1. fro LHD:


      1. Disconnect the front seatback frame sub-assembly RH (front tilt motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q2-2 - Q2-3 Tilt switch on 4.8 to 5.1 V

    2. for RHD:


      1. Disconnect the front seatback frame sub-assembly LH (front tilt motor) connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        Q23-2 - Q23-3 Tilt switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    NG

  10. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (FRONT TILT MOTOR))


    1. for LHD:


      1. Disconnect the Q8 No. 2 position control ECU assembly connector.

      2. Disconnect the Q2 front seat adjuster assembly RH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q8-25 (SSFV) - Q2-2 Always Below 1 Ω
        Q8-25 (SSFV) or Q2-2 - Other terminals and body ground Always 10 kΩ or higher
        Q8-16 (SGND) - Q2-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the Q28 No. 2 position control ECU assembly connector.

      2. Disconnect the Q23 front seat adjuster assembly LH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q28-25 (SSFV) - Q23-2 Always Below 1 Ω
        Q28-25 (SSFV) or Q23-2 - Other terminals and body ground Always 10 kΩ or higher
        Q28-16 (SGND) - Q23-3 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

  11. INSPECT FRONT SEAT ADJUSTER ASSEMBLY


    1. Remove the front seat adjuster assembly (front tilt motor).

      Click here

    2. Inspect the front seat adjuster assembly (front tilt motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT ADJUSTER ASSEMBLY Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - FRONT SEAT ADJUSTER ASSEMBLY (FRONT TILT MOTOR))


    1. for LHD:


      1. Disconnect the Q6 No. 2 position control ECU assembly connectors.

      2. Disconnect the Q2 front seat adjuster assembly RH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q6-7 (FRV+) - Q2-1 Always Below 1 Ω
        Q6-7 (FRV+) or Q2-1 - Other terminals and body ground Always 10 kΩ or higher
        Q6-6 (FRV-) - Q2-4 Always Below 1 Ω
        Q6-6 (FRV-) or Q2-4 - Other terminals and body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the Q26 No. 2 position control ECU assembly connectors.

      2. Disconnect the Q23 front seat adjuster assembly LH (front tilt motor) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        Q26-7 (FRV+) - Q23-1 Always Below 1 Ω
        Q26-7 (FRV+) or Q23-1 - Other terminals and body ground Always 10 kΩ or higher
        Q26-6 (FRV-) - Q23-4 Always Below 1 Ω
        Q26-6 (FRV-) or Q23-4 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR