DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Occupant Classification System - Diagnostics - Introduction >> Occupant Classification System >> Operation Check [11/2023 - ] >> Operation Check [11/2023 - ]

Operation Check [11/2023 - ]

  1. PRECAUTION FOR OPERATION CHECK 
    WARNING:

    Use the correct procedure to replace the airbag parts.

    GTY744259Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK SRS WARNING LIGHT 
    1. Primary check
      1. Turn the ignition switch to ON and check that the SRS warning light turns on.
        GTY864881Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Turn the ignition switch off. Wait for at least 2 seconds, and then turn the ignition switch to ON. The SRS warning light comes on for approximately 6 seconds and diagnosis of the airbag system (including the seat belt pretensioners) is performed.
        NOTE:

        Turn the ignition switch off when the auxiliary battery is connected.

        HINT: 

        • If the SRS warning light remains on for approximately 6 seconds or more after the ignition switch has been turned to ON, there may be a malfunction with the airbag system.
        • If the warning light occasionally turns on approximately 6 seconds or more after the ignition switch has been turned to ON, there may be a short to +B, short to ground or an open in the SRS warning light circuit.
        • If the warning light illuminates after turning the ignition switch off or to ACC, there may be a malfunction in the power source circuit or combination meter assembly.
        • The SRS warning light turns off, and then turns on. This blinking pattern indicates a source voltage drop. The SRS warning light turns off 6 to 10 seconds after the source voltage returns to normal.
  3. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Initial check
      1. Turn the ignition switch to ON.
      2. The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, and then goes off for approximately 2 seconds.
        GTY1115619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *A for Type A
        *B for Type B
      3. Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.
        INDICATOR OPERATION

        Front Passenger Seat Condition Passenger Airbag ON/OFF Indicator SRS Warning Light
        ON Indicator OFF Indicator
        Vacant OFF ON OFF
        Adult*1 is seated ON OFF OFF
        Child*2 is seated ON or OFF*2 OFF or ON*2 OFF
        Child restraint system is installed OFF ON OFF
        Occupant classification system failure OFF ON ON
        1. *1: The system judges a person of average adult weight or more as an adult. If a smaller adult sits in the front passenger seat, the system may not recognize them as an adult depending on their physique and posture.
        2. *2: The system may not recognize a child or a child in a child restraint system as a child depending on factors such as the positioning of the child restraint system or the child's physique or posture.

        HINT: 

        • The timing chart below shows the operation of the passenger airbag ON/OFF indicator. Use the chart to check the indicator light circuit.
        • When the occupant classification system has trouble, both the SRS warning light and passenger airbag ON/OFF indicator ("OFF") come on. In this case, check for DTCs for "Airbag System" first.
        GTY1018739Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Diesel-Data.com