DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostics - Introduction >> Airbag System >> Operation Check [10/2022 - 11/2023] >> Operation Check [10/2022 - 11/2023]

Operation Check [10/2022 - 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
      GTY792148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Turn the ignition switch to ON and check that the SRS warning light turns on.
      2. Turn the ignition switch off. Wait for at least 2 seconds, and then turn the ignition switch to ON. Check that the SRS warning light illuminates for approximately 6 seconds while diagnosis of the airbag system is performed.

        HINT: 

        • If the SRS warning light remains on for more than approximately 6 seconds after the ignition switch is turned to ON, the airbag system may be malfunctioning.
        • If the SRS warning light occasionally turns on after the ignition switch has been ON for approximately 6 seconds, there may be an open, or short to +B or ground in the SRS warning light circuit.
        • If the SRS warning light illuminates after the ignition switch is turned off or to ACC, there may be a malfunction in the airbag sensor assembly power source circuit or combination meter assembly.
        • After the initial check, if the SRS warning light turns off and then on repeatedly, a drop in airbag sensor assembly power source voltage is occurring. The SRS warning light will turn off 10 seconds after the power 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, then turns off for approximately 2 seconds.
      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 passenger airbag ON/OFF indicator illuminates based on the following timing chart in order to check the indicator light circuit.
        • When the occupant classification system is malfunctioning, both the SRS warning light and passenger airbag ON/OFF indicator ("OFF") come on. In this case, perform troubleshooting for the airbag system DTCs first.
        GTY428280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. PASSENGER AIRBAG ON/OFF INDICATOR CHECK 
    1. Turn the ignition switch to ON.
      GTY1115619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for Type A
      *B for Type B
    2. Check that the passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then turns off for approximately 2 seconds.

      HINT: 

      Refer to the indicator operation table in Function of Passenger Airbag ON/OFF Indicator for the passenger airbag ON/OFF indicator operation when the ignition switch is turned to ON and approximately 6 seconds elapse.

  5. INSPECT AIRBAG COMPONENTS 
    1. Inspect the SRS parts in table below.
      Component to Inspect Procedure
      Horn button assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the horn button assembly installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Cuts on the surface or in the grooves
        • Small cracks on the surface or in the grooves
        • Significant discoloration on the surface or in the grooves

        OK

        No defects are found.

        If any defects are found, replace the horn button assembly with a new one.
      Lower No. 1 instrument panel airbag assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the lower No. 1 instrument panel airbag assembly installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Cuts
        • Small cracks
        • Significant discoloration

        OK

        No defects are found.

        If any defects are found, replace the lower No. 1 instrument panel airbag assembly with a new one.
      Instrument panel passenger airbag assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the instrument panel passenger airbag assembly installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Cuts on the instrument panel safety pad sub-assembly around the instrument panel passenger airbag assembly
        • Small cracks on the instrument panel safety pad sub-assembly around the instrument panel passenger airbag assembly
        • Significant discoloration on the instrument panel safety pad sub-assembly around the instrument panel passenger airbag assembly

        OK

        No defects are found.

        If any defects are found, replace the instrument panel safety pad sub-assembly with a new one.
      Curtain shield airbag assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the curtain shield airbag assemblies installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Cuts on each pillar garnish or the roof headlining assembly around the curtain shield airbag assemblies
        • Small cracks on each pillar garnish or the roof headlining assembly around the curtain shield airbag assemblies
        • Significant discoloration on each pillar garnish or the roof headlining assembly around the curtain shield airbag assemblies

        OK

        No defects are found.

        If any defects are found, replace each pillar garnish or the roof headlining assembly with a new one.
      Front seat airbag assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the front seat airbag assemblies installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Scratches, broken or frayed threads on the surface of the front seatback assembly around the front seat airbag assemblies
        • Small cracks in the front seatback assembly around the front seat airbag assemblies
        • Significant discoloration on the front seatback assembly around the front seat airbag assemblies

        OK

        No defects are found.

        If any defects are found, replace the separate type front seatback pad or separate type front seatback cover with a new one.
      Front seat cushion airbag assembly RH
      1. Perform a diagnostic system check.
      2. Visually check for defects with the front seat cushion airbag assembly RH installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Scratches, broken or frayed threads on the surface of the front seat cushion assembly around the front seat cushion airbag assembly RH
        • Small cracks on the front seat cushion assembly around the front seat cushion airbag assembly RH
        • Significant discoloration on the front seat cushion assembly around the front seat cushion airbag assembly RH

        OK

        No defects are found.

        If any defects are found, replace the separate type front seat cushion pad or separate type front seat cushion cover with a new one.
      Front seat outer belt assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the front seat outer belt assemblies installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Cuts
        • Small cracks
        • Significant discoloration

        OK

        No defects are found.

        If any defects are found, replace the front seat outer belt assembly with a new one.
      Rear seat outer belt assembly
      1. Perform a diagnostic system check.
      2. Visually check for defects with the rear seat outer belt assemblies installed to the vehicle.

        HINT: 

        The defects are as follows:

        • Cuts
        • Small cracks
        • Significant discoloration

        OK

        No defects are found.

        If any defects are found, replace the rear seat outer belt assembly with a new one.
      Airbag sensor assembly
      1. Perform a diagnostic system check.
      Front airbag sensor
      Side airbag sensor assembly
      Side No. 2 airbag sensor
      Rear airbag sensor
      Occupant detection ECU
      Harness and connector
Diesel-Data.com