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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 center airbag sensor assembly and the seat position airbag sensor.

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

DTC No. DTC Detection Condition Trouble Area
B1653/35

  • The center airbag sensor assembly 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 airbag sensor circuit.

  • Front seat inner belt assembly LH malfunction

  • Seat position airbag sensor malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire/Floor wire

  • Front seat inner belt assembly LH/RH

  • Seat position airbag sensor

  • Center airbag sensor assembly
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WIRING DIAGRAM


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  1. A019KG4E03

    for LHD:

  2. A019KG4E04

    for RHD:

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK VEHICLE CONDITION


    1. Check vehicle condition.

      Result
      Result Proceed to
      for LHD A
      for RHD B

  2. Click here

    CHECK CONNECTORS


    1. Turn the engine switch off.

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

      Note:

      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 center 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 connected securely, reconnect the connectors and proceed to the next inspection.

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

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

      OK
      The terminals are not deformed or damaged.

  3. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. A019KQME03

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

    2. Using SST, connect terminals 9 (LSP+) and 17 (LSP-) of connector B.

      Note:

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

      09843-18040

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

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *4

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *5 Connector B *6 Connector E

  4. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. A019MF4E01

      Disconnect SST 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 2. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

  5. Click here

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


    1. A019MF4E01

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

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

  6. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. A019MF4E01

      Turn the engine switch off.

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

      Note:

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

    3. 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 4. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

  7. Click here

    CHECK SEAT POSITION AIRBAG SENSOR


    1. A019P0JE01

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

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

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

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

    5. Turn the engine switch off.

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

    7. Check for DTCs (Click here).

      OK
      DTC B1653/35 is not output.
      Table 5. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      Tip:

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


  8. Click here

    REPLACE SEAT POSITION AIRBAG SENSOR


    1. Turn the engine switch off.

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

      Note:

      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 part (Click here).

      Tip:

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


  9. Click here

    CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A019P0JE01

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

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

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

    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).

      OK
      DTC B1653/35 is not output.
      Table 6. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      Tip:

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


  10. Click here

    USE SIMULATION METHOD TO CHECKClick here

  11. Click here

    CHECK NO. 2 FLOOR WIRE (OPEN)


    1. A019MSCE02

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

      Tip:

      SST 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
      P7-2 (LSP+) - P7-4 (LSP-) Always Below 1 Ω
      Table 7. Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH *4 No. 2 Floor Wire
      *5

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *6

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *7 Connector B *8 Connector C

  12. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT)


    1. A019KIQE02

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P7-2 (LSP+) - P7-4 (LSP-) Always 1 MΩ or higher
      Table 8. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *6 Connector C

  13. Click here

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


    1. A019KIQE02

      Turn the engine switch off.

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

      Note:

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

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

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

    5. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P7-2 (LSP+) - Body ground Engine switch on (IG) Below 1 V
      P7-4 (LSP-) - Body ground Engine switch on (IG) Below 1 V
      Table 9. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *6 Connector C

  14. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. A019KIQE02

      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
      P7-2 (LSP+) - Body ground Always 1 MΩ or higher
      P7-4 (LSP-) - Body ground Always 1 MΩ or higher
      Table 10. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *6 Connector C

  15. Click here

    REPLACE NO. 2 FLOOR WIRE

  16. Click here

    END

  17. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  18. Click here

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LHClick here

  19. Click here

    REPLACE WIRE HARNESS

  20. Click here

    CHECK CONNECTORS


    1. Turn the engine switch off.

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

      Note:

      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 center 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 connected securely, reconnect the connectors and proceed to the next inspection.

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

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

      OK
      The terminals are not deformed or damaged.

  21. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. A019MUZE01

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

    2. Using SST, connect terminals 16 (RSP+) and 24 (RSP-) of connector B.

      Note:

      Do not forcibly insert SST 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 11. Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *4

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *5 Connector B *6 Connector E

  22. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. A019O3IE01

      Disconnect SST 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 12. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

  23. Click here

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


    1. A019O3IE01

      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 Switch 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
      Table 13. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

  24. Click here

    CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. A019O3IE01

      Turn the engine switch off.

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

      Note:

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

    3. 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 14. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

  25. Click here

    CHECK SEAT POSITION AIRBAG SENSOR


    1. A019O8NE01

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

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

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

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

    5. Turn the engine switch off.

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

    7. Check for DTCs (Click here).

      OK
      DTC B1653/35 is not output.
      Table 15. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      Tip:

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


  26. Click here

    REPLACE SEAT POSITION AIRBAG SENSOR


    1. Turn the engine switch off.

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

      Note:

      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 part (Click here).

      Tip:

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


  27. Click here

    CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A019O8NE01

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

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

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

    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).

      OK
      DTC B1653/35 is not output.
      Table 16. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      Tip:

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


  28. Click here

    CHECK FLOOR WIRE (OPEN)


    1. A019JPRE01

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

      Tip:

      SST 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
      O35-2 (RSP+) - O35-4 (RSP-) Always Below 1 Ω
      Table 17. Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH *4 Floor Wire
      *5

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *6

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)
      *7 Connector B *8 Connector C

  29. Click here

    CHECK FLOOR WIRE (SHORT)


    1. A019L91E01

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O35-2 (RSP+) - O35-4 (RSP-) Always 1 MΩ or higher
      Table 18. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)
      *6 Connector C

  30. Click here

    CHECK FLOOR WIRE (SHORT TO B+)


    1. A019L91E01

      Turn the engine switch off.

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

      Note:

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

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

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

    5. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      O35-2 (RSP+) - Body ground Engine switch on (IG) Below 1 V
      O35-4 (RSP-) - Body ground Engine switch on (IG) Below 1 V
      Table 19. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)
      *6 Connector C

  31. Click here

    CHECK FLOOR WIRE (SHORT TO GROUND)


    1. A019L91E01

      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
      O35-2 (RSP+) - Body ground Always 1 MΩ or higher
      O35-4 (RSP-) - Body ground Always 1 MΩ or higher
      Table 20. Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly RH
      *4 Floor Wire
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)
      *6 Connector C

  32. Click here

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RHClick here

  33. Click here

    REPLACE FLOOR WIRE