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 sensor 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. DTC Detection Condition Trouble Area
B1655/37

  • The 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 belt buckle switch RH circuit.

  • Front seat inner belt assembly RH malfunction

  • Airbag sensor assembly malfunction

  • No. 2 floor wire

  • Front seat inner belt assembly RH (Seat belt buckle switch RH)

  • Airbag sensor assembly

WIRING DIAGRAM

A003Y4UE29

INSPECTION PROCEDURE

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 Click here.

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the power switch off.

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

      CAUTION:

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

    3. Check that the connectors are properly connected to the airbag sensor assembly and front seat inner belt assembly RH.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

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

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

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  2. CHECK NO. 2 FLOOR WIRE (OPEN)


    1. Using SST, connect terminals 15 (RBE+) and 14 (RBE-) of connector B.

      A003WO6E01

      Note

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

      SST
      09843-18040

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q19-2 (RBE+) - Q19-1 (RBE-) Always Below 1 Ω
      Text in Illustration
      *1 Front Seat Inner Belt Assembly RH *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector B
      *5 Connector C - -
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      		 *b

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK NO. 2 FLOOR WIRE (SHORT)


    1. A003ZTTE01
      Text in Illustration
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      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
      Q19-2 (RBE+) - Q19-1 (RBE-) Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

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


    1. A003ZTTE01
      Text in Illustration
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

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

    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
      Q19-2 (RBE+) - Body ground Power switch on (IG) Below 1 V
      Q19-1 (RBE-) - Body ground Power switch on (IG) Below 1 V

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  5. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. A003ZTTE01
      Text in Illustration
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly RH)

      Turn the power switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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
      Q19-2 (RBE+) - Body ground Always 1 MΩ or higher
      Q19-1 (RBE-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  6. CHECK FRONT SEAT INNER BELT ASSEMBLY RH


    1. A003ZKZE08
      Text in Illustration
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly

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

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

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

    4. Clear the DTCs stored in memory Click here.

    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.

      OK
      DTC B1655/37 is not output.

      Tech Tips

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


    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  7. REPLACE FRONT SEAT INNER BELT ASSEMBLY RH


    1. Turn the power switch off.

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

      CAUTION:

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

    3. Replace the front seat inner belt assembly RH with a known good one Click here for Manual seat, Click here for Power seat).

      Tech Tips

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


    NEXT

  8. CHECK AIRBAG SENSOR ASSEMBLY


    1. A003ZKZE08
      Text in Illustration
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly

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

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

    3. Clear the DTCs stored in memory Click here.

    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.

      OK
      DTC B1655/37 is not output.

      Tech Tips

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


    NG

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    OK

    END