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 center 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 center 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.

  • A center airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Front seat inner belt assembly LH

  • Seat position airbag sensor

  • Center airbag sensor assembly
B1653/35 (for RHD)

One of the following conditions is met:


  • The center 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.

  • A center airbag sensor assembly malfunction.

  • Floor wire

  • Front seat inner belt assembly RH

  • Seat position airbag sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

A01FGXXE03
A01FGXXE04

INSPECTION PROCEDURE

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 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 engine 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 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 center airbag sensor assembly and seat position airbag sensor.

    2. A01FEDRE01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

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

      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.

      A01FIADE02
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center 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 Center Airbag Sensor Assembly)

    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
      1(LSP-) - Body ground Engine switch on (IG) Below 1 V
      2(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, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 24 (LSP-) and 16 (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 NO. 2 FLOOR WIRE Click here

    OK

  5. CHECK SEAT POSITION AIRBAG SENSOR


    1. A01FI22E01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the center 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 engine switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs 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.

      Tech Tips

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


    NG

    CHECK SEAT POSITION AIRBAG SENSOR Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  6. CHECK SEAT POSITION AIRBAG SENSOR


    1. Turn the engine 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 CENTER AIRBAG SENSOR ASSEMBLY


    1. A01FI22E01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

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

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

    3. Clear the DTCs 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.

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    END (SEAT POSITION AIRBAG SENSOR WAS DEFECTIVE)

  8. CHECK NO. 2 FLOOR WIRE


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

      A01FJ3SE01
      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 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 Center Airbag Sensor Assembly)

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

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U4-2 (LSP+) - Body ground Engine switch on (IG) Below 1 V
      U4-4 (LSP-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine 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 (LSP+) and 24 (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
      U4-2 (LSP+) - U4-4 (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
      U4-2 (LSP+) - U4-4 (LSP-) Always 1 MΩ or higher
      U4-2 (LSP+) - Body ground Always 1 MΩ or higher
      U4-4 (LSP-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

  9. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine 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 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 center airbag sensor assembly and seat position airbag sensor.

    2. A01FHKME01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

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

      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.

      A01FGDHE02
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center 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 Center Airbag Sensor Assembly)

    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
      1(RSP-) - Body ground Engine switch on (IG) Below 1 V
      2(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, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 17 (RSP-) and 9 (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 FLOOR WIRE Click here

    OK

  12. CHECK SEAT POSITION AIRBAG SENSOR


    1. A01FI3JE01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the center 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 engine switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs 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.

      Tech Tips

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


    NG

    CHECK SEAT POSITION AIRBAG SENSOR Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  13. CHECK SEAT POSITION AIRBAG SENSOR


    1. Turn the engine 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 CENTER AIRBAG SENSOR ASSEMBLY


    1. A01FI3JE01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

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

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

    3. Clear the DTCs 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.

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    END (SEAT POSITION AIRBAG SENSOR WAS DEFECTIVE)

  15. CHECK FLOOR WIRE


    1. Disconnect the floor wire connector from the front seat Inner belt assembly RH.

      A01FH82E01
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center Airbag Sensor Assembly
      *3 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 Center Airbag Sensor Assembly)

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

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T5-2 (RSP+) - Body ground Engine switch on (IG) Below 1 V
      T5-4 (RSP-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine 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 17 (RSP-) and 9 (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
      T5-2 (RSP+) - T5-4 (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
      T5-2 (RSP+) - T5-4 (RSP-) Always 1 MΩ or higher
      T5-2 (RSP+) - Body ground Always 1 MΩ or higher
      T5-4 (RSP-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

    FRONT SEAT INNER BELT ASSEMBLY RH