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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 sensor 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. DTC Detection Condition Trouble Area
B1653/35

  • The airbag sensor 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 sensor assembly malfunction
  • for LHD:

  • Floor wire

  • Front seat inner belt assembly LH

  • Seat position airbag sensor

  • Airbag sensor assembly


  • for RHD:

  • No. 2 floor wire

  • Front seat inner belt assembly RH

  • Seat position airbag sensor

  • Airbag sensor assembly
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WIRING DIAGRAM


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  1. A0005B1E03
    Table 1.
    *a Seat Position Airbag Sensor
    *b Front Seat Inner Belt Assembly LH
    *c Airbag Sensor Assembly

    for LHD:

  2. A0005B1E16

    for RHD:

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CAUTION / NOTICE / HINT

Note:

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

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PROCEDURE


  1. Click here

    CHECK VEHICLE CONDITION


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for LHD A
      for RHD B

  2. Click here

    CHECK CONNECTORS


    1. Turn the power switch off.

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

      CAUTION:

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

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

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

      OK
      The terminals are not deformed or damaged.

  3. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. A0003JTE02

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

    2. 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 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
      Table 2. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  4. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. A00050ZE03

      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
      Table 3. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  5. Click here

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


    1. A00050ZE03

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

    2. Turn the power 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 Power switch on (IG) Below 1 V
      1 (LSP-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

      CAUTION:

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

      Table 4. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  6. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. A00050ZE03

      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
      Table 5. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  7. Click here

    CHECK DTC


    1. A0004WYE02

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

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

    3. Clear the DTCs stored in memory (Click here).

    4. Turn the power switch off.

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

    6. Check for DTCs (Click here).

      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.

    7. Turn the power switch off.

      Table 6. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

  8. Click here

    CHECK SEAT POSITION AIRBAG SENSOR


    1. A0004WYE02

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

      CAUTION:

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

    2. 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.

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

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

    5. Turn the power switch off.

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

    7. Check for DTCs (Click here).

      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.

    8. Turn the power switch off.

    9. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

    10. Restore the seat position airbag sensor that was installed for testing to its original location (Click here).

      Table 7. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

  9. Click here

    CHECK FLOOR WIRE (OPEN)


    1. A000945E02

      Disconnect the 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
      P20-4 (LSP+) - P20-3 (LSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

      Table 8. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LH (Click here)

    • NG

      REPLACE FLOOR WIRE

  10. Click here

    CHECK FLOOR WIRE (SHORT)


    1. A0008HTE02

      Disconnect the 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
      P20-4 (LSP+) - P20-3 (LSP-) Always 1 MΩ or higher
      Table 9. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LH (Click here)

    • NG

      REPLACE FLOOR WIRE

  11. Click here

    CHECK FLOOR WIRE (SHORT TO B+)


    1. A0008HTE02

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

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P20-4 (LSP+) - Body ground Power switch on (IG) Below 1 V
      P20-3 (LSP-) - Body ground Power switch on (IG) Below 1 V
      Table 10. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LH (Click here)

    • NG

      REPLACE FLOOR WIRE

  12. Click here

    CHECK FLOOR WIRE (SHORT TO GROUND)


    1. A0008HTE02

      Disconnect the 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
      P20-4 (LSP+) - Body ground Always 1 MΩ or higher
      P20-3 (LSP-) - Body ground Always 1 MΩ or higher
      Table 11. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY LH (Click here)

    • NG

      REPLACE FLOOR WIRE

  13. Click here

    CHECK CONNECTORS


    1. Turn the power switch off.

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

      CAUTION:

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

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

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

      OK
      The terminals are not deformed or damaged.

  14. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. A00098JE02

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

    2. 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 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
      Table 12. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  15. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. A0008RSE02

      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
      Table 13. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  16. Click here

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


    1. A0008RSE02

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

    2. Turn the power 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 Power switch on (IG) Below 1 V
      1 (RSP-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

      CAUTION:

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

      Table 14. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  17. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. A0008RSE02

      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
      Table 15. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

  18. Click here

    CHECK DTC


    1. A0006NQE02

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

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

    3. Clear the DTCs stored in memory (Click here).

    4. Turn the power switch off.

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

    6. Check for DTCs (Click here).

      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.

    7. Turn the power switch off.

      Table 16. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

  19. Click here

    CHECK SEAT POSITION AIRBAG SENSOR


    1. A0006NQE02

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

      CAUTION:

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

    2. 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.

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

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

    5. Turn the power switch off.

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

    7. Check for DTCs (Click here).

      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.

    8. Turn the power switch off.

    9. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

    10. Restore the seat position airbag sensor that was installed for testing to its original location (Click here).

      Table 17. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

  20. Click here

    CHECK NO. 2 FLOOR WIRE (OPEN)


    1. A0003EYE02

      Disconnect the No. 2 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
      Q35-4 (RSP+) - Q35-3 (RSP-) Always Below 1 Ω

    3. Disconnect the service wire from the connector B.

      Table 18. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 No. 2 Floor Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RH (Click here)

    • NG

      REPLACE NO. 2 FLOOR WIRE

  21. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT)


    1. A0006QRE02

      Disconnect the No. 2 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
      Q35-4 (RSP+) - Q35-3 (RSP-) Always 1 MΩ or higher
      Table 19. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RH (Click here)

    • NG

      REPLACE NO. 2 FLOOR WIRE

  22. Click here

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


    1. A0006QRE02

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

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q35-4 (RSP+) - Body ground Power switch on (IG) Below 1 V
      Q35-3 (RSP-) - Body ground Power switch on (IG) Below 1 V
      Table 20. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RH (Click here)

    • NG

      REPLACE NO. 2 FLOOR WIRE

  23. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. A0006QRE02

      Disconnect the No. 2 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
      Q35-4 (RSP+) - Body ground Always 1 MΩ or higher
      Q35-3 (RSP-) - Body ground Always 1 MΩ or higher
      Table 21. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 No. 2 Floor Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

    • OK

      REPLACE FRONT SEAT INNER BELT ASSEMBLY RH (Click here)

    • NG

      REPLACE NO. 2 FLOOR WIRE