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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Occupant Classification System - Diagnostic Codes & Symptom Tests >> Occupant Classification System >> DTC B1793-16: Load Sensor for Occupant Detection System Circuit Voltage Below Threshold [11/2023 - ] >> Procedure

DTC B1793-16: Load Sensor for Occupant Detection System Circuit Voltage Below Threshold [11/2023 - ]: Procedure

  1. CHECK CONNECTION OF CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    3. Check that the connectors are properly connected to the airbag sensor assembly and separate type front seat cushion spring assembly RH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the airbag sensor assembly connector.
      GTY985316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Separate Type Front Seat Cushion Spring Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
    2. Disconnect the separate type front seat cushion spring assembly RH connector.
    3. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - AUXILIARY BATTERY) 
    1. Disconnect the airbag sensor assembly connector.
      GTY1180812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    3. Turn the ignition switch to ON.
    4. Operate all components of the electrical systems (defogger, wipers, headlights, heater blower, etc.).
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H58-36 (IGR) - Body ground Ignition switch ON 8 to 16 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M10-24 (SVC) - Other terminals and body ground Always 10 kΩ or higher
      e5-1 (SVC) - Other terminals and body ground Always 10 kΩ or higher
      e6-1 (SVC) - Other terminals and body ground Always 10 kΩ or higher
      GTY1177864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Separate Type Front Seat Cushion Spring Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Separate Type Front Seat Cushion Spring Assembly RH (Front Occupant Classification Sensor LH))
      *c Front view of wire harness connector
      (to Separate Type Front Seat Cushion Spring Assembly RH (Rear Occupant Classification Sensor LH))

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Turn the ignition switch off.
      GTY1179232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Separate Type Front Seat Cushion Spring Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Separate Type Front Seat Cushion Spring Assembly RH (Front Occupant Classification Sensor LH))
      *b Front view of wire harness connector
      (to Separate Type Front Seat Cushion Spring Assembly RH (Rear Occupant Classification Sensor LH))
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    3. Connect the connector to the airbag sensor assembly.
    4. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      e5-1 (SVC) - Body ground Ignition switch ON 6.2 V or higher
      e6-1 (SVC) - Body ground Ignition switch ON 6.2 V or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH 

    for Manual Seat: Refer to REMOVAL [11/2023 - ]

    for Power Seat: Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

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