AIRBAG SYSTEM, Diagnostic DTC:B1655/37

DTC Code DTC Name
B1655/37 Seat Belt Buckle Switch RH Circuit Malfunction

DESCRIPTION

The seat belt buckle switch RH circuit consists of the airbag ECU assembly and front seat inner belt assembly RH.

DTC B1655/37 is stored when a malfunction is detected in the seat belt buckle switch RH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1655/37 Seat Belt Buckle Switch RH Circuit Malfunction

    One of the following conditions is met:

  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the seat belt buckle switch RH circuit for 2 seconds.

  • A front seat inner belt assembly RH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Front seat inner belt assembly RH

  • Airbag ECU assembly

WIRING DIAGRAM

B00598RE32

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.

    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

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check vehicle condition.

      Result
      Proceed to
      for LHD
      for RHD

    for RHD

    CHECK CONNECTION OF CONNECTORS Click here

    for LHD

  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 airbag ECU assembly and front seat inner belt assembly RH.

      Result
      Proceed to
      Connectors are properly connected
      Connectors are not properly connected

    Connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    Connectors are properly connected

  3. CHECK CONNECTORS


    1. B0058UTC15
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire

      Disconnect the connectors from the airbag ECU assembly and front seat inner belt assembly RH.

    2. Check that the connectors (on the airbag ECU assembly side and front seat inner belt assembly RH side) are not damaged.

      Result
      Proceed to
      Connectors are not deformed or damaged
      Connectors are deformed or damaged

    Connectors are deformed or damaged

    REPLACE FLOOR WIRE

    Connectors are not deformed or damaged

  4. CHECK FLOOR WIRE


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

      B0058RHC03
      *1 Front Seat Inner Belt Assembly RH *2 Airbag ECU Assembly
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 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 ECU 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
      P41-2 (RBE+) - Body ground Engine switch on (IG) Below 1 V
      P41-1 (RBE-) - 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 10 (RBE+) and 18 (RBE-) 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
      P41-2 (RBE+) - P41-1 (RBE-) 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
      P41-2 (RBE+) - P41-1 (RBE-) Always 1 MΩ or higher
      P41-2 (RBE+) - Body ground Always 1 MΩ or higher
      P41-1 (RBE-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK DTC


    1. B005A1VC35
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly and front seat inner belt assembly RH.

    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


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1655/37 is not output
      DTC B1655/37 is output

      Tech Tips

      Codes other than DTC B1655/37 may be output at this time, but they are not related to this check.


    DTC B1655/37 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1655/37 is output

  6. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH


    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 front seat inner belt assembly RH.

      for Manual Seat: Click here

      for Power Seat: Click here

      Tech Tips

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

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK DTC


    1. B005A1VC36
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU 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


      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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1655/37 is not output
      DTC B1655/37 is output

      Tech Tips

      Codes other than DTC B1655/37 may be output at this time, but they are not related to this check.


    DTC B1655/37 is not output

    END (FRONT SEAT INNER BELT ASSEMBLY RH WAS DEFECTIVE)

    DTC B1655/37 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here

  8. 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 airbag ECU assembly and front seat inner belt assembly RH.

      Result
      Proceed to
      Connectors are properly connected
      Connectors are not properly connected

    Connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    Connectors are properly connected

  9. CHECK CONNECTORS


    1. B0058UTC15
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire

      Disconnect the connectors from the airbag ECU assembly and front seat inner belt assembly RH.

    2. Check that the connectors (on the airbag ECU assembly side and front seat inner belt assembly RH side) are not damaged.

      Result
      Proceed to
      Connectors are not deformed or damaged
      Connectors are deformed or damaged

    Connectors are deformed or damaged

    REPLACE FLOOR WIRE

    Connectors are not deformed or damaged

  10. CHECK FLOOR WIRE


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

      B005A2CC02
      *1 Front Seat Inner Belt Assembly RH *2 Airbag ECU Assembly
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 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 ECU 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
      P12-2 (RBE+) - Body ground Engine switch on (IG) Below 1 V
      P12-1 (RBE-) - 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 10 (RBE+) and 18 (RBE-) 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
      P12-2 (RBE+) - P12-1 (RBE-) 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
      P12-2 (RBE+) - P12-1 (RBE-) Always 1 MΩ or higher
      P12-2 (RBE+) - Body ground Always 1 MΩ or higher
      P12-1 (RBE-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  11. CHECK DTC


    1. B005A1VC35
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly and front seat inner belt assembly RH.

    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


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1655/37 is not output
      DTC B1655/37 is output

      Tech Tips

      Codes other than DTC B1655/37 may be output at this time, but they are not related to this check.


    DTC B1655/37 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1655/37 is output

  12. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH


    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 front seat inner belt assembly RH.

      for Manual Seat: Click here

      for Power Seat: Click here

      Tech Tips

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

      Result
      Proceed to
      NEXT

    NEXT

  13. CHECK DTC


    1. B005A1VC36
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU 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


      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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1655/37 is not output
      DTC B1655/37 is output

      Tech Tips

      Codes other than DTC B1655/37 may be output at this time, but they are not related to this check.


    DTC B1655/37 is not output

    END (FRONT SEAT INNER BELT ASSEMBLY RH WAS DEFECTIVE)

    DTC B1655/37 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here