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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 B1653-35: Seat Position Airbag Sensor Circuit Malfunction [12/2012 - ] >> Procedure

DTC B1653-35: Seat Position Airbag Sensor 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 seat position airbag sensor.
      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 seat position airbag sensor.
      GTY383305Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
    2. Check that the connectors (on the airbag sensor assembly side and seat position airbag sensor side) are not damaged.

      Refer to DIAGNOSIS SYSTEM [12/2012 - ] .

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

    Result: 

    Connectors are deformed or damaged 

    REPLACE HARNESS AND CONNECTOR OR FRONT SEAT INNER BELT ASSEMBLY LH 

    Result: 

    Connectors are not deformed or damaged 

    See step  3

  3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY365167Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Seat Position Airbag Sensor *2 Airbag Sensor Assembly
      *3 Connector E *4 Connector B
      *5 Service Wire - -
      *a Front view of wire harness connector
      (to Seat Position Airbag Sensor)      		 *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
      1 - Body ground Ignition switch ON Below 1 V
      2 - 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 24 (LSP-) and 16 (LSP+) 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
      1 - 2 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
      1 - 2 Always 1 MΩ or higher
      1 - Body ground Always 1 MΩ or higher
      2 - Body ground Always 1 MΩ or higher
      Result Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. CHECK SEAT POSITION AIRBAG SENSOR 
    1. Connect the connectors to the airbag sensor assembly and seat position airbag sensor.
      GTY376813Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Seat Position Airbag Sensor
      *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 

    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 

      Result Proceed to
      DTC B1653/35 is not output
      DTC B1653/35 is output

      HINT: 

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1653/35 is not output 

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

    Result: 

    DTC B1653/35 is output 

    See step  5

  5. CHECK SEAT POSITION AIRBAG SENSOR 
    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 seat position airbag sensor.

      Refer to REMOVAL [12/2012 - ] .

      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.
      GTY376813Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Seat Position Airbag Sensor
      *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 B1653/35 is not output
      DTC B1653/35 is output

      HINT: 

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.

    Result: 

    DTC B1653/35 is not output 

    END (SEAT POSITION AIRBAG SENSOR WAS DEFECTIVE) 

    Result: 

    DTC B1653/35 is output 

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

  7. CHECK NO. 2 FLOOR WIRE 
    1. Disconnect the No. 2 floor wire connector from the front seat inner belt assembly LH.
      GTY373902Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
      *1 Seat Position Airbag Sensor *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH *4 No. 2 Floor Wire
      *5 Connector C *6 Connector B
      *7 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. 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
      N14-4 (LSP+) - Body ground Ignition switch ON Below 1 V
      N14-3 (LSP-) - 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 24 (LSP-) and 16 (LSP+) 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
      N14-4 (LSP+) - N14-3 (LSP-) 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
      N14-4 (LSP+) - N14-3 (LSP-) Always 1 MΩ or higher
      N14-4 (LSP+) - Body ground Always 1 MΩ or higher
      N14-3 (LSP-) - Body ground Always 1 MΩ or higher
      Result Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH. Refer to  REMOVAL [12/2012 - 08/2016]  or  REMOVAL [08/2016 - ]  . 

    Result: 

    NG 

    REPLACE NO. 2 FLOOR WIRE 

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