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Home >> Toyota >> 2016 >> RAV4 Limited, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes & Circuit Tests) (Except Hybrid) >> Airbag System >> DTC B1656-38: Seat Belt Buckle Switch LH Circuit Malfunction [12/2012 - ] >> Procedure

DTC B1656-38: Seat Belt Buckle Switch LH Circuit Malfunction [12/2012 - ]: Procedure

  1. 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 front seat inner belt assembly LH.
      Result Proceed to
      Connectors are properly connected
      Connectors are not properly connected

    Result: 

    Connectors are not properly connected 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    Connectors are properly connected 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag sensor assembly and front seat inner belt assembly LH.
      GTY383981Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Seat Inner Belt Assembly LH
      *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire
    2. Check that the connectors (on the airbag sensor assembly side and front seat inner belt assembly LH side) are not damaged.
      Result Proceed to
      Connectors are not deformed or damaged
      Connectors are deformed or damaged

    Result: 

    Connectors are deformed or damaged 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    Connectors are not deformed or damaged 

    See step  3

  3. CHECK NO. 2 FLOOR WIRE 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY383806Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Seat Inner Belt Assembly LH *2 Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 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. 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
      N14-2 (LBE+) - Body ground Ignition switch ON Below 1 V
      N14-1 (LBE-) - 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 15 (LBE+) and 23 (LBE-) of connector B. NOTICE:
      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
      N14-2 (LBE+) - N14-1 (LBE-) 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
      N14-2 (LBE+) - N14-1 (LBE-) Always 1 MΩ or higher
      N14-2 (LBE+) - Body ground Always 1 MΩ or higher
      N14-1 (LBE-) - Body ground Always 1 MΩ or higher
      Result Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK FRONT SEAT INNER BELT ASSEMBLY LH 
    1. Connect the connector to the airbag sensor assembly and front seat inner belt assembly LH.
      GTY384366Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Seat Inner Belt Assembly LH
      *2 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, and wait for at least 60 seconds.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ] .

      Body Electrical > SRS Airbag > Clear DTCs 

      Result Proceed to
      DTC B1656/38 is not output
      DTC B1656/38 is output
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON, and wait for at least 60 seconds.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ] .

      Body Electrical > SRS Airbag > Trouble Codes 

      HINT: 

      Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1656/38 is not output 

    USE SIMULATION METHOD TO CHECK. Refer to  DIAGNOSIS SYSTEM [12/2012 - ]  . 

    Result: 

    DTC B1656/38 is output 

    See step  5

  5. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 
    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 front seat inner belt assembly LH.

      Refer to REMOVAL [12/2012 - 08/2016] or REMOVAL [08/2016 - ] .

      HINT: 

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

    Result: 

    NEXT 

    See step  6

  6. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY384366Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Seat Inner Belt Assembly LH
      *2 Airbag Sensor Assembly
    2. Turn the ignition switch to ON, and wait for at least 60 seconds.
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ] .

      Body Electrical > SRS Airbag > Clear DTCs 

    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON, and wait for at least 60 seconds.
    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2012 - ] .

      Body Electrical > SRS Airbag > Trouble Codes 

      Result Proceed to
      DTC B1656/38 is not output
      DTC B1656/38 is output

      HINT: 

      Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1656/38 is not output 

    END (FRONT SEAT INNER BELT ASSEMBLY LH WAS DEFECTIVE) 

    Result: 

    DTC B1656/38 is output 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [12/2012 - ]  . 

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