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AIRBAG SYSTEM, Diagnostic DTC:B1653/35

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

The seat position airbag sensor circuit consists of the airbag ECU assembly and seat position airbag sensor.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1653/35 Seat Position Airbag Sensor Circuit Malfunction

  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the seat position airbag sensor circuit.

  • Seat position airbag sensor malfunction

  • Airbag ECU assembly malfunction
  • for LHD:

  • No. 2 floor wire

  • Front seat inner belt assembly LH

  • Seat position airbag sensor

  • Airbag ECU assembly


  • for RHD:

  • Floor wire

  • Front seat inner belt assembly RH

  • Seat position airbag sensor

  • Airbag ECU assembly

 Does not apply to test/check mode
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WIRING DIAGRAM


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  1. B0067PAE01
    Table 1.
    *a Seat Position Airbag Sensor
    *b Front Seat Inner Belt Assembly LH
    *c Airbag ECU Assembly

    for LHD:

  2. B0067PAE04

    for RHD:

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CAUTION / NOTICE / HINT

Note:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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PROCEDURE


  1. Click here

    CHECK VEHICLE CONDITION


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      LHD A
      RHD B

  2. Click here

    CHECK CONNECTORS


    1. Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag ECU assembly, front seat inner belt assembly LH and seat position airbag sensor.

      OK
      The connectors are properly connected.
      Tip:

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag ECU assembly, front seat inner belt assembly LH and seat position airbag sensor.

    5. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. B0066CCC04
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      Connect the connectors to the front seat inner belt assembly LH and No. 2 floor wire.

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

      Note:

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (LSP+) - 1 (LSP-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. B0065X6C01
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (LSP+) - 1 (LSP-) Always 1 MΩ or higher
      Result
      Result
      OK
      NG

  5. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)


    1. B0065X6C01
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2 (LSP+) - Body ground Engine switch on (IG) Below 1 V
      1 (LSP-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Result
      Proceed to
      OK
      NG

  6. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. B0065X6C01
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (LSP+) - Body ground Always 1 MΩ or higher
      1 (LSP-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK DTC


    1. B0067VBC01
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly and seat position airbag sensor.

    2. Connect the cable to the negative (-) battery terminal.

    3. Clear the DTCs stored in memory.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    4. Turn the engine switch off.

    5. Turn the engine switch on (IG), and wait for at least 60 seconds.

    6. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      OK
      DTC B1653/35 is not output.
      Tip:

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

      Result
      Result
      OK
      NG

  8. Click here

    CHECK SEAT POSITION AIRBAG SENSOR


    1. B0067VBC01
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly

      Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Replace the seat position airbag sensor with a known good one.

      Click here

      Tip:

      Perform the following inspection using known good parts from another vehicle if possible.

    4. Connect the cable to the negative (-) battery terminal.

    5. Clear the DTCs stored in memory.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 60 seconds.

    8. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      OK
      DTC B1653/35 is not output.
      Tip:

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

    9. Turn the engine switch off.

    10. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    11. Restore the seat position airbag sensor that was installed for testing to its original location.

      Click here

      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. B0067PMC03
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

      Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U12-4 (LSP+) - Body ground Always 1 MΩ or higher
      U12-3 (LSP-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LHClick here

    • NG

      REPLACE NO. 2 FLOOR WIRE

  10. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT TO B+)


    1. B0067PMC03
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

      Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

    2. Connect the cable to the negative (-) battery terminal.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U12-4 (LSP+) - Body ground Engine switch on (IG) Below 1 V
      U12-3 (LSP-) - Body ground Engine switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LHClick here

    • NG

      REPLACE NO. 2 FLOOR WIRE

  11. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT)


    1. B0067PMC03
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

      Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U12-4 (LSP+) - U12-3 (LSP-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LHClick here

    • NG

      REPLACE NO. 2 FLOOR WIRE

  12. Click here

    CHECK NO. 2 FLOOR WIRE (OPEN)


    1. B0066IBC03
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

      Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.

      Tip:

      The service wire has already been inserted into connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U12-4 (LSP+) - U12-3 (LSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LHClick here

    • NG

      REPLACE NO. 2 FLOOR WIRE

  13. Click here

    CHECK CONNECTORS


    1. Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag ECU assembly, front seat inner belt assembly RH and seat position airbag sensor.

      OK
      The connectors are properly connected.
      Tip:

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag ECU assembly, front seat inner belt assembly RH and seat position airbag sensor.

    5. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

  14. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. B0066QSC04
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      Connect the connectors to the front seat inner belt assembly RH and floor wire.

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

      Note:

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (RSP+) - 1 (RSP-) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

  15. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. B0067HAC02
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (RSP+) - 1 (RSP-) Always 1 MΩ or higher
      Result
      Result
      OK
      NG

  16. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)


    1. B0067HAC02
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2 (RSP+) - Body ground Engine switch on (IG) Below 1 V
      1 (RSP-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Result
      Proceed to
      OK
      NG

  17. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. B0067HAC02
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (RSP+) - Body ground Always 1 MΩ or higher
      1 (RSP-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

  18. Click here

    CHECK DTC


    1. B0067V3C05
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly and seat position airbag sensor.

    2. Connect the cable to the negative (-) battery terminal.

    3. Clear the DTCs stored in memory.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    4. Turn the engine switch off.

    5. Turn the engine switch on (IG), and wait for at least 60 seconds.

    6. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      OK
      DTC B1653/35 is not output.
      Tip:

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

      Result
      Result
      OK
      NG

  19. Click here

    CHECK SEAT POSITION AIRBAG SENSOR


    1. B0067V3C05
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly

      Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Replace the seat position airbag sensor with a known good one.

      Click here

      Tip:

      Perform the following inspection using known good parts from another vehicle if possible.

    4. Connect the cable to the negative (-) battery terminal.

    5. Clear the DTCs stored in memory.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 60 seconds.

    8. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      OK
      DTC B1653/35 is not output.
      Tip:

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

    9. Turn the engine switch off.

    10. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    11. Restore the seat position airbag sensor that was installed for testing to its original location.

      Click here

      Result
      Proceed to
      OK
      NG

  20. Click here

    CHECK FLOOR WIRE (SHORT TO GROUND)


    1. B00664YC04
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      Disconnect the floor wire from the front seat inner belt assembly RH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T4-4 (RSP+) - Body ground Always 1 MΩ or higher
      T4-3 (RSP-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RHClick here

    • NG

      REPLACE FLOOR WIRE

  21. Click here

    CHECK FLOOR WIRE (SHORT TO B+)


    1. B00664YC04
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      Disconnect the floor wire from the front seat inner belt assembly RH.

    2. Connect the cable to the negative (-) battery terminal.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      T4-4 (RSP+) - Body ground Engine switch on (IG) Below 1 V
      T4-3 (RSP-) - Body ground Engine switch on (IG) Below 1 V
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RHClick here

    • NG

      REPLACE FLOOR WIRE

  22. Click here

    CHECK FLOOR WIRE (SHORT)


    1. B00664YC04
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      Disconnect the floor wire from the front seat inner belt assembly RH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T4-4 (RSP+) - T4-3 (RSP-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RHClick here

    • NG

      REPLACE FLOOR WIRE

  23. Click here

    CHECK FLOOR WIRE (OPEN)


    1. B0065FAC04
      *1 Seat Position Airbag Sensor
      *2 Airbag ECU Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      Disconnect the floor wire from the front seat inner belt assembly RH.

      Tip:

      The service wire has already been inserted into connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T4-4 (RSP+) - T4-3 (RSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RHClick here

    • NG

      REPLACE FLOOR WIRE