REAR POWER SEAT CONTROL SYSTEM, Diagnostic DTC:B2651

DTC Code DTC Name
B2651 Reclining Sensor Malfunction

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
B2651 Reclining Sensor Malfunction The forward and rearward lock detection position of the sensor is the same.

  • Position control ECU assembly LH

  • Position control ECU assembly RH

  • Rear seat reclining adjuster sub-assembly LH (reclining motor)

  • Rear seat reclining adjuster sub-assembly RH (reclining motor)

  • Harness or connector

WIRING DIAGRAM


  1. for Rear Seat RH:

    B004RZQE02

  2. for Rear Seat LH:

    B004RZQE03

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 > Rear Right Seat > Clear DTCs
      Body Electrical > Rear Left Seat > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Rear Right Seat > Trouble Codes
      Body Electrical > Rear Left Seat > Trouble Codes
      OK
      DTC B2651 is not output.
      Result
      Result Proceed to
      DTC B2651 is not output A
      DTC B2651 output from "Rear Right Seat" B
      DTC B2651 output from "Rear Left Seat" C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    PERFORM ACTIVE TEST USING GTS (SEAT RECLINING) Click here

    B

  3. PERFORM ACTIVE TEST USING GTS (SEAT RECLINING)


    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 / Rear Right Seat / Active Test.

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


      Body Electrical > Rear Right Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -

      Body Electrical > Rear Right Seat > Active Test
      Tester Display
      Seat Reclining
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY RH (RECLINING MOTOR) Click here

    OK

  4. CHECK POSITION CONTROL ECU ASSEMBLY RH (RECLINING MOTOR CIRCUIT)


    1. Disconnect the rear reclining adjuster sub-assembly RH (reclining motor) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L170-3 (RBBA) - L170-6 (GND) Reclining switch on 4.8 to 5.1 V
      L170-5 (PVCC) - L170-6 (GND) Reclining switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY RH Click here

    NG

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY RH (RECLINING MOTOR))


    1. Disconnect the R7 position control ECU assembly RH connector.

    2. Disconnect the L170 rear seat reclining adjuster sub-assembly RH (reclining motor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R7-13 (SSRR) - L170-2 (SSRR) Always Below 1 Ω
      R7-13 (SSRR) or L170-2 (SSRR) - Other terminals and body ground Always 10 kΩ or higher
      R7-30 (PVC2) - L170-5 (PVCC) Always Below 1 Ω
      R7-30 (PVC2) or L170-5 (PVCC) - Other terminals and body ground Always 10 kΩ or higher
      R7-7 (SGND) - L170-6 (GND) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. INSPECT REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY RH (RECLINING MOTOR)


    1. Remove the rear seat reclining adjuster sub-assembly RH (reclining motor).

      Click here

    2. Inspect the rear seat reclining adjuster sub-assembly RH (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY RH Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY RH - REAR SEAT RECLINIG ADJUSTER SUB-ASSEMBLY RH (RECLINING MOTOR))


    1. Disconnect the R4 and R5 position control ECU assembly RH connectors.

    2. Disconnect the L170 rear seat reclining adjuster sub-assembly RH (reclining motor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R5-10 (RCL+) - L170-4 (PBFW) Always Below 1 Ω
      R5-10 (RCL+) or L170-4 (PBFW) - Other terminals and body ground Always 10 kΩ or higher
      R4-6 (RCL-) - L170-3 (RBBA) Always Below 1 Ω
      R4-6 (RCL-) or L170-3 (RBBA) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY RH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. PERFORM ACTIVE TEST USING GTS (SEAT RECLINING)


    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 / Rear Left Seat / Active Test.

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


      Body Electrical > Rear Left Seat > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Seat Reclining Seat reclining operation OFF/Rear/Front -

      Body Electrical > Rear Left Seat > Active Test
      Tester Display
      Seat Reclining
      OK
      Motor operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY LH (RECLINING MOTOR) Click here

    OK

  9. CHECK POSITION CONTROL ECU ASSEMBLY LH (RECLINING MOTOR CIRCUIT)


    1. Disconnect the rear seat reclining adjuster sub-assembly LH (reclining motor) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L151-4 (RBBA) - L151-6 (GND) Reclining switch on 4.8 to 5.1 V
      L151-5 (PVCC) - L151-6 (GND) Reclining switch on 4.8 to 5.1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY LH Click here

    NG

  10. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY LH (RECLINING MOTOR))


    1. Disconnect the R41 position control ECU assembly LH connector.

    2. Disconnect the L151 rear seat reclining adjuster sub-assembly LH (reclining) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R41-13 (SSRR) - L151-2 (SSRR) Always Below 1 Ω
      R41-13 (SSRR) or L151-2 (SSRR) - Other terminals and body ground Always 10 kΩ or higher
      R41-30 (PVC2) - L151-5 (PVCC) Always Below 1 Ω
      R41-30 (PVC2) or L151-5 (PVCC) - Other terminals and body ground Always 10 kΩ or higher
      R41-7 (SGND) - L151-6 (GND) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. INSPECT REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY LH (RECLINING MOTOR)


    1. Remove the rear seat reclining adjuster sub-assembly LH (reclining motor).

      Click here

    2. Inspect the rear seat reclining adjuster sub-assembly LH (reclining motor).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT RECLINING ADJUSTER SUB-ASSEMBLY LH Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY LH - REAR SEAT RECLINIG ADJUSTER SUB-ASSEMBLY LH (RECLINING MOTOR))


    1. Disconnect the R38 and R39 position control ECU assembly LH connectors.

    2. Disconnect the L151 rear seat reclining adjuster sub-assembly LH (reclining motor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R39-10 (RCL+) - L151-3 (PBFW) Always Below 1 Ω
      R39-10 (RCL+) or L151-3 (PBFW) - Other terminals and body ground Always 10 kΩ or higher
      R38-6 (RCL-) - L151-4 (RBBA) Always Below 1 Ω
      R38-6 (RCL-) or L151-4 (RBBA) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY LH Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR