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Home >> Toyota >> 2016 >> RAV4 SE, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Diagnostic Codes & Circuit Tests) (Except Hybrid) >> Airbag System >> DTC B1617-84: Lost Communication with Front Airbag Sensor LH; DTC B1618-84: Front Airbag Sensor LH Initialization Incomplete [12/2012 - ] >> Procedure

DTC B1617-84: Lost Communication with Front Airbag Sensor LH; DTC B1618-84: Front Airbag Sensor LH Initialization Incomplete [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 airbag sensor LH.
      Result Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    Result: 

    The connectors are not properly connected 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    The connectors are properly connected 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag sensor assembly and front airbag sensor LH.
    2. Check that the connectors (on the airbag sensor assembly side and front airbag sensor LH side) are not damaged.
      GTY362457Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      Result Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    Result: 

    The connectors are deformed or damaged 

    REPLACE HARNESS AND CONNECTOR 

    Result: 

    The connectors are not deformed or damaged 

    See step  3

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY370797Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 Connector E *4 Connector B
      *5 Service Wire - -
      *a Front view of wire harness connector
      (to Front Airbag Sensor 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
      A24-2 (+SL) - Body ground Ignition switch ON Below 1 V
      A24-1 (-SL) - 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 30 (+SL) and 28 (-SL) 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
      A24-2 (+SL) - A24-1 (-SL) 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
      A24-2 (+SL) - A24-1 (-SL) Always 1 MΩ or higher
      A24-2 (+SL) - Body ground Always 1 MΩ or higher
      A24-1 (-SL) - Body ground Always 1 MΩ or higher
      Result Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. CHECK FRONT AIRBAG SENSOR LH 
    1. Connect the connectors to the airbag sensor assembly.
      GTY378416Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Airbag Sensor RH
      *2 Airbag Sensor Assembly
    2. Interchange the front airbag sensor LH with RH and connect the connectors to them.
    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    4. Turn the ignition switch to ON, and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

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

      Body Electrical > SRS Airbag > Clear DTCs 

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

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

      Body Electrical > SRS Airbag > Trouble Codes 

      Result Proceed to
      DTC B1617/84 or B1618/84 is output
      DTC B1612/83 or B1613/83 is output
      DTC B1612/83, B1613/83, B1617/84 and B1618/84 are not output

      HINT: 

      Codes other than DTC B1612/83, B1613/83, B1617/84 and B1618/84 may be output at this time, but they are not related to this check.

    9. Turn the ignition switch off.
    10. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    11. Return the front airbag sensor RH and LH to their original positions and connect the connectors to them.

    Result: 

    DTC B1617/84 or B1618/84 is output 

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

    Result: 

    DTC B1612/83 or B1613/83 is output 

    REPLACE FRONT AIRBAG SENSOR LH. Refer to  REMOVAL [12/2012 - 10/2015]  or  REMOVAL [10/2015 - ]  . 

    Result: 

    DTC B1612/83, B1613/83, B1617/84 and B1618/84 are not output 

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

  5. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      GTY378808Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Front Airbag Sensor LH *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire *4 Instrument Panel Wire
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a Front view of wire harness connector
      (to Engine Room Main Wire)      		 *b Rear view of wire harness connector
      (to 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.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      AG9-1 (+SL) - Body ground Ignition switch ON Below 1 V
      AG9-2 (-SL) - Body ground Ignition switch ON Below 1 V
    5. Turn the ignition 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 30 (+SL) and 28 (-SL) 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
      AG9-1 (+SL) - AG9-2 (-SL) 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
      AG9-1 (+SL) - AG9-2 (-SL) Always 1 MΩ or higher
      AG9-1 (+SL) - Body ground Always 1 MΩ or higher
      AG9-2 (-SL) - Body ground Always 1 MΩ or higher
      Result Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ENGINE ROOM MAIN WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

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