AIRBAG SYSTEM, Diagnostic DTC:B1653/35

DTC Code DTC Name
B1653/35 Seat Position Airbag Sensor Circuit Malfunction

DESCRIPTION

The seat position sensor circuit consists of the center airbag sensor and the seat position sensor.

DTC B1653/35 is stored when a malfunction is detected in the seat position sensor circuit.

for LHD
DTC Code DTC Detection Condition Trouble Area
B1653/35

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the seat position sensor circuit for 2 seconds.

  • A seat position sensor malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Seat position sensor

  • Center airbag sensor assembly
for RHD
DTC Code DTC Detection Condition Trouble Area
B1653/35

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the seat position sensor circuit for 2 seconds.

  • A seat position sensor malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Seat position sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

B001WGLE07
w/ Side Airbag (for LHD)
*a Seat Position Sensor
*b Center Airbag Sensor
*c Front Seat Inner Belt LH
B001WVME05
w/o Side Airbag (for LHD)
*a Seat Position Sensor
*b Front Seat Inner Belt LH
*c Center Airbag Sensor
B001WGLE08
B001WVME06

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check vehicle condition.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK FOR DTC Click here

    A

  2. CHECK FOR DTC


    1. B001XRLE03
      *1 w/ Side Airbag:
      *2 Seat Position Sensor
      *3 Center Airbag Sensor
      *4 w/o Side Airbag:

      Turn the ignition switch to ON, and wait for at least 60 seconds.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON, and wait for at least 60 seconds.

    5. Check for DTCs Click here.

      OK
      DTC B1653 is not output.

      Tech Tips

      Codes other than DTC B1653 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the center airbag sensor and the seat position sensor.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor and the seat position sensor.

    2. Check that the connectors (on the center airbag sensor side and seat position sensor side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - SEAT POSITION SENSOR)


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      B001VMHE01

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K10-4 (LSP+) - Body ground Ignition switch ON Below 1 V
      K10-8 (LSP-) - Body ground Ignition switch ON Below 1 V

    4. w/ Side Airbag:


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

      3. Using a service wire, connect terminals 9 (LSP+) and 17 (LSP-) of connector B.

        Note

        Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K10-4 (LSP+) - K10-8 (LSP-) Always Below 1 Ω

      5. Disconnect the service wire from connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K10-4 (LSP+) - K10-8 (LSP-) Always 1 MΩ or higher
        K10-4 (LSP+) - Body ground Always 1 MΩ or higher
        K10-8 (LSP-) - Body ground Always 1 MΩ or higher

    5. w/o Side Airbag:


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

      3. Using a service wire, connect terminals 14 (LSP+) and 13 (LSP-) of connector B.

        Note

        Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K10-4 (LSP+) - K10-8 (LSP-) Always Below 1 Ω

      5. Disconnect the service wire from connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        K10-4 (LSP+) - K10-8 (LSP-) Always 1 MΩ or higher
        K10-4 (LSP+) - Body ground Always 1 MΩ or higher
        K10-8 (LSP-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK SEAT POSITION SENSOR (FRONT SEAT INNER BELT LH)


    1. B001XRLE03
      *1 w/ Side Airbag:
      *2 Seat Position Sensor
      *3 Center Airbag Sensor
      *4 w/o Side Airbag:

      Connect the connectors to the center airbag sensor and the seat position sensor.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1653 is not output.

      Tech Tips

      Codes other than DTC B1653 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  7. REPLACE SEAT POSITION SENSOR (FRONT SEAT INNER BELT LH)


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Replace the front seat inner belt LH Click here.

      Tech Tips

      Perform the inspection using parts from a normally functioning vehicle if possible.


    NEXT

  8. CHECK CENTER AIRBAG SENSOR


    1. B001XRLE03
      *1 w/ Side Airbag:
      *2 Seat Position Sensor
      *3 Center Airbag Sensor
      *4 w/o Side Airbag:

      Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    2. Turn the ignition switch to ON, and wait for at least 60 seconds.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON, and wait for at least 60 seconds.

    6. Check for DTCs Click here.

      OK
      DTC B1653 is not output.

      Tech Tips

      Codes other than DTC B1653 may be output at this time, but they are not related to this check.


    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  9. CHECK FOR DTC


    1. B001WNFE15
      *1 Center Airbag Sensor
      *2 Seat Position Sensor

      Turn the ignition switch to ON, and wait for at least 60 seconds.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON, and wait for at least 60 seconds.

    5. Check for DTCs Click here.

      OK
      DTC B1653/35 is not output.

      Tech Tips

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  10. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the center airbag sensor and the seat position sensor.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  11. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor and the seat position sensor.

    2. Check that the connectors (on the center airbag sensor side and seat position sensor side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  12. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - SEAT POSITION SENSOR)


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      B001YQYE02

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L33-4 (RSP+) - Body ground Ignition switch ON Below 1 V
      L33-8 (RSP-) - Body ground Ignition switch ON Below 1 V

    4. w/ Side Airbag:


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

      3. Using a service wire, connect terminals 16 (RSP+) and 24 (RSP-) of connector B.

        Note

        Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L33-4 (RSP+) - L33-8 (RSP-) Always Below 1 Ω

      5. Disconnect the service wire from connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L33-4 (RSP+) - L33-8 (RSP-) Always 1 MΩ or higher
        L33-4 (RSP+) - Body ground Always 1 MΩ or higher
        L33-8 (RSP-) - Body ground Always 1 MΩ or higher

    5. w/o Side Airbag:


      1. Turn the ignition switch off.

      2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

      3. Using a service wire, connect terminals 12 (RSP+) and 13 (RSP-) of connector B.

        Note

        Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L33-4 (RSP+) - L33-8 (RSP-) Always Below 1 Ω

      5. Disconnect the service wire from connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        L33-4 (RSP+) - L33-8 (RSP-) Always 1 MΩ or higher
        L33-4 (RSP+) - Body ground Always 1 MΩ or higher
        L33-8 (RSP-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  13. CHECK SEAT POSITION SENSOR (FRONT SEAT INNER BELT RH)


    1. B001WNFE15
      *1 Center Airbag Sensor
      *2 Seat Position Sensor

      Connect the connectors to the center airbag sensor and the seat position sensor.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1653/35 is not output.

      Tech Tips

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  14. REPLACE SEAT POSITION SENSOR


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Replace the seat position sensor Click here.

      Tech Tips

      Perform inspection using parts from a normal vehicle if possible.


    NEXT

  15. CHECK CENTER AIRBAG SENSOR


    1. B001WNFE15
      *1 Center Airbag Sensor
      *2 Seat Position Sensor

      Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    2. Turn the ignition switch to ON, and wait for at least 60 seconds.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON, and wait for at least 60 seconds.

    6. Check for DTCs Click here.

      OK
      DTC B1653/35 is not output.

      Tech Tips

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.


    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here