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 (seat belt buckle switch 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 Warning Indicate Test Mode / Check Mode
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 (seat belt buckle switch RH)

  • Airbag ECU assembly

 Comes on Not applicable

WIRING DIAGRAM

B004CLNE60
*a Front Inner Seat Belt Assembly RH (Seat Belt Buckle Switch RH)
*b Airbag ECU Assembly

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.

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

PROCEDURE


  1. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

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

  2. CHECK CONNECTORS


    1. B004ALKC30
      *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

  3. CHECK FLOOR WIRE


    1. B004BVNC02
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)
      *b

      Front view of wire harness connector

      (to Airbag ECU Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      X13-2 (RBE+) - Body ground Power switch on (IG) Below 1 V
      X13-1 (RBE-) - 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, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 29 (RBE+) and 30 (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
      X13-2 (RBE+) - X13-1 (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
      X13-2 (RBE+) - X13-1 (RBE-) Always 1 MΩ or higher
      X13-2 (RBE+) - Body ground Always 1 MΩ or higher
      X13-1 (RBE-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK DTC


    1. B004AAXC15
      *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 (-) auxiliary battery terminal, and wait for at least 2 seconds.

    3. Turn the power 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 power switch off.

    6. Turn the power 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

  5. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH


    1. Turn the power switch off.

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

    3. Replace the front seat inner belt assembly RH.

      Tech Tips

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

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK DTC


    1. B004AAXC15
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag ECU Assembly

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

    2. Turn the power 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 power switch off.

    5. Turn the power 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