AIRBAG SYSTEM, Diagnostic DTC:B1653/35

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

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 Code Detection Condition Trouble Area
B1653/35 (for LHD)

One of the following conditions is met:


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

  • A seat position airbag sensor malfunction.

  • An airbag sensor assembly malfunction.

  • Floor wire

  • Front seat inner belt assembly LH

  • Seat position airbag sensor

  • Airbag sensor assembly
B1653/35 (for RHD)

One of the following conditions is met:


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

  • A seat position airbag sensor malfunction.

  • An airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Front seat inner belt assembly RH

  • Seat position airbag sensor

  • Airbag sensor assembly

WIRING DIAGRAM

A004NK2E25
for LHD
*a VS
*b Seat Position Airbag Sensor
*c Front Seat Inner Belt Assembly LH
*d Airbag Sensor Assembly
A004NK2E22

CAUTION / NOTICE / HINT

Note


  • After turning the ignition 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 Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for RHD A
      for LHD B

    A

    CHECK CONNECTION OF CONNECTORS Click here

    B

  2. 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 airbag sensor assembly and seat position airbag sensor.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


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

    2. A004S7GE04
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT


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

      A004NH6E02
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Airbag Sensor Assembly
      *3 Connector E *4 Connector B
      *5 Service Wire - -
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

    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
      1 (LSP-) - Body ground Ignition switch ON Below 1 V
      2 (LSP+) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

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

    6. 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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (LSP-) - 2 (LSP+) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (LSP-) - 2 (LSP+) Always 1 MΩ or higher
      1 (LSP-) - Body ground Always 1 MΩ or higher
      2 (LSP+) - Body ground Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE Click here

    OK

  5. CHECK FOR DTC


    1. A004RFOE04
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

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

  6. CHECK SEAT POSITION AIRBAG 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 airbag sensor Click here.

      Tech Tips

      Perform the inspection using parts from a normal vehicle if possible.


    NEXT

  7. CHECK FOR DTC


    1. A004RFOE05
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

      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

    END (SEAT POSITION AIRBAG SENSOR WAS DEFECTIVE)

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  8. CHECK FLOOR WIRE


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

      A004P81E02
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Airbag Sensor Assembly
      *3 Floor Wire *4 Front Seat Inner Belt Assembly LH
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G67-2 (LSP+) - Body ground Ignition switch ON Below 1 V
      G67-1 (LSP-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. 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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G67-2 (LSP+) - G67-1 (LSP-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G67-2 (LSP+) - G67-1 (LSP-) Always 1 MΩ or higher
      G67-2 (LSP+) - Body ground Always 1 MΩ or higher
      G67-1 (LSP-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    NG

    REPLACE FLOOR WIRE

  9. 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 airbag sensor assembly and seat position airbag sensor.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  10. CHECK CONNECTORS


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

    2. A004N7EE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  11. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT


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

      A004S3DE02
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Airbag Sensor Assembly
      *3 Connector E *4 Connector B
      *5 Service Wire - -
      *a

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

    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
      1 (RSP-) - Body ground Ignition switch ON Below 1 V
      2 (RSP+) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

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

    6. 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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (RSP-) - 2 (RSP+) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (RSP-) - 2 (RSP+) Always 1 MΩ or higher
      1 (RSP-) - Body ground Always 1 MΩ or higher
      2 (RSP+) - Body ground Always 1 MΩ or higher

    NG

    CHECK NO. 2 FLOOR WIRE Click here

    OK

  12. CHECK FOR DTC


    1. A004SETE02
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

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

  13. CHECK SEAT POSITION AIRBAG 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 airbag sensor Click here.

      Tech Tips

      Perform the inspection using parts from a normal vehicle if possible.


    NEXT

  14. CHECK FOR DTC


    1. A004SETE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly

      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

    END (SEAT POSITION AIRBAG SENSOR WAS DEFECTIVE)

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

  15. CHECK NO. 2 FLOOR WIRE


    1. Disconnect the No. 2 floor wire connector from the front seat Inner belt assembly RH.

      A004QJ2E02
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Front Seat Inner Belt Assembly RH
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      		 *b

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H29-2 (RSP+) - Body ground Ignition switch ON Below 1 V
      H29-1 (RSP-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. 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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H29-2 (RSP+) - H29-1 (RSP-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H29-2 (RSP+) - H29-1 (RSP-) Always 1 MΩ or higher
      H29-2 (RSP+) - Body ground Always 1 MΩ or higher
      H29-1 (RSP-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

    NG

    REPLACE NO. 2 FLOOR WIRE