FRONT POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2652

DTC Code DTC Name
B2652 Front Vertical Sensor Malfunction

DESCRIPTION


When the position control ECU assembly LH*1 or RH*2 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 LH*1 or RH*2

  • Power seat tilt motor assembly LH*1 or RH*2

  • Harness or connector

WIRING DIAGRAM

Figure 1. for LHD:

B004CGAE42
*a SENG
*b Power Seat Tilt Motor Assembly LH
*c Position Control ECU Assembly LH
*d Front Seat Adjuster Assembly LH

Figure 2. for RHD:

B004CGAE43
*a SENG
*b Power Seat Tilt Motor Assembly RH
*c Position Control ECU Assembly RH
*d Front Seat Adjuster Assembly RH

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 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. 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
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

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


    1. Connect the GTS to the DLC3.

    2. Turn the power 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 POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT) Click here

    OK

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


    1. B004BW4C28
      *a

      Front view of wire harness connector

      (to Power Seat Tilt Motor Assembly LH)

      for LHD:


      1. Disconnect the power seat tilt motor assembly LH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        w2-2 - w2-3 Tilt switch on 4.8 to 5.1 V
    2. B004BW4C31
      *a

      Front view of wire harness connector

      (to Power Seat Tilt Motor Assembly RH)

      fro RHD:


      1. Disconnect the power seat tilt motor assembly RH connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        v19-2 - v19-3 Tilt switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT) Click here

    NG

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


    1. for LHD:


      1. Disconnect the w12 position control ECU assembly LH connector.

      2. Disconnect the w2 power seat tilt motor assembly LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w12-10 (SSFV) - w2-2 Always Below 1 Ω
        w12-10 (SSRS) or w2-2 - Other terminals and body ground Always 10 kΩ or higher
        w12-12 (SENG) - w2-3 Always Below 1 Ω

    2. for RHD:


      1. Disconnect the v12 position control ECU assembly RH connector.

      2. Disconnect the v19 power seat tilt motor assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v12-10 (SSFV) - v19-2 Always Below 1 Ω
        v12-10 (SSRS) or v19-2 - Other terminals and body ground Always 10 kΩ or higher
        v12-12 (SENG) - v19-3 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

  6. INSPECT POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT)


    1. Remove the power seat tilt motor assembly (driver seat).

      Click here

    2. Inspect the power seat tilt motor assembly (driver seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POWER SEAT TILT MOTOR ASSEMBLY (DRIVER SEAT) Click here

    OK

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


    1. for LHD:


      1. Disconnect the w10 and w11 position control ECU assembly LH connectors.

      2. Disconnect the w2 power seat tilt motor assembly LH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        w10-7 (FRV+) - w2-1 Always Below 1 Ω
        w10-7 (FRV+) or w2-1 - Other terminals and body ground Always 10 kΩ or higher
        w11-4 (FRV-) - w2-4 Always Below 1 Ω
        w11-4 (FRV-) or w2-4 - Other terminals and body ground Always 10 kΩ or higher

    2. for RHD:


      1. Disconnect the v10 and v11 position control ECU assembly RH connectors.

      2. Disconnect the v19 power seat tilt motor assembly RH connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        v10-7 (FRV+) - v19-1 Always Below 1 Ω
        v10-7 (FRV+) or v19-1 - Other terminals and body ground Always 10 kΩ or higher
        v11-4 (FRV-) - v19-4 Always Below 1 Ω
        v11-4 (FRV-) or v19-4 - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY (DRIVER SEAT) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR