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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 100 (Supplemental Restraint System (Diagnostics - Introduction)) >> Airbag System >> Diagnosis System >> Diagnosis System

Diagnosis System

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DLC3 
    1. Check the DLC3, refer to GENERAL INFORMATION .
  2. FUNCTION OF SRS WARNING LIGHT 
    1. Primary check
      1. Turn the ignition switch off. Wait for at least 2 seconds, then turn the ignition switch on (IG). The SRS warning light comes on for approximately 6 seconds and the diagnosis of the airbag system (including the seat belt pretensioners) is performed.

        HINT: 

        If trouble is detected during the primary check, the SRS warning light remains on even after the primary check period (of approximately 6 seconds) has elapsed.

    2. Constant check
      1. After the primary check, the center airbag sensor assembly constantly monitors the airbag system for trouble.

        HINT: 

        If trouble is detected during the constant check, the center airbag sensor assembly functions as follows:

        • The SRS warning light comes on.
        • The SRS warning light goes off, and then comes on. This blinking pattern indicates a source voltage drop. The SRS warning light goes off 10 seconds after the source voltage returns to normal.
    3. Review
      1. When the airbag system is normal:

        The SRS warning light comes on only during the primary check period (of approximately 6 seconds after the ignition switch is turned on (IG).

      2. When the airbag system has trouble:
        • The SRS warning light remains on even after the primary check period has elapsed.
        • The SRS warning light goes off after the primary check, but comes on again during the constant check.
        • The SRS warning light does not come on when turning the ignition switch from off to on (IG).

        HINT: 

        The center airbag sensor assembly keeps the SRS warning light on if the airbag has been deployed.

  3. SRS WARNING LIGHT CHECK 
    1. Turn the ignition switch on (IG), and check that the SRS warning light comes on for approximately 6 seconds (primary check).
      Fig 1: Identifying SRS Warning Light
      GTY139555Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the SRS warning light goes off approximately 6 seconds after the ignition switch is turned on (IG) (constant check).

      HINT: 

      When any of the following symptoms occur, refer to Problem Symptoms Table, refer to PROBLEM SYMPTOMS TABLE .

      • The SRS warning light comes on occasionally, after the primary check period has elapsed.
      • The SRS warning light comes on, but a DTC is not output.
      • The ignition switch is turned from off to on (IG), but the SRS warning light does not come on.
  4. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Initial check
      1. Turn the ignition switch on (IG).
      2. The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, then goes off for approximately 2 seconds.
      3. Approximately 6 seconds after the ignition switch is turned on (IG), the passenger airbag ON/OFF indicator will be ON/OFF depending on the conditions listed below.
        Condition "ON" indicator "OFF" indicator
        Vacant OFF OFF
        Adult is seated. ON OFF
        Child is seated. OFF ON
        Child restraint system is set. OFF ON
        Front passenger occupant classification failure OFF ON

        HINT: 

        • The timing chart shown below can be used when checking the indicator light circuit for the passenger airbag ON/OFF indictor.
        • When the occupant classification system has trouble, both the SRS warning light and the passenger airbag ON/OFF indicator ("OFF") come on. In this case, check the DTCs in Airbag System first. Then troubleshoot the occupant classification system if DTC B1650/32 is detected, and troubleshoot the passenger airbag ON/OFF indicator if DTC B1660/43 is detected.
        Fig 2: Timing Chart
        GTY201398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. PASSENGER AIRBAG ON/OFF INDICATOR CHECK 
    1. Turn the ignition switch on (IG).
      Fig 3: Identifying Passenger Airbag ON/OFF Indicator
      GTY204139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then goes off for approximately 2 seconds.

      HINT: 

      Refer to the table in the previous step regarding the passenger airbag ON/OFF indicator when the ignition switch is turned on (IG) and approximately 6 seconds pass.

  6. ACTIVATION PREVENTION MECHANISM 
    1. FUNCTION OF ACTIVATION PREVENTION MECHANISM
      1. An activation prevention mechanism is built into the connector (on the center airbag sensor assembly side) of the airbag system squib circuit to prevent accidental airbag activation.
      2. This mechanism closes the circuit when the connector is disconnected by bringing the short spring into contact with the terminals and shutting off external electricity to prevent accidental airbag activation.
    2. RELEASING OF ACTIVATION PREVENTION MECHANISM
      1. To release the activation prevention mechanism, insert a piece of paper with the same thickness as the male terminal (approximately 0.5 mm (0.0197 in.) between the terminals and the short spring to break the connection.
      2. Refer to the following illustrations concerning connectors utilizing the activation prevention mechanism and its release method.
        WARNING:

        Never release the activation prevention mechanism on the squib connector even when inspecting with the squib disconnected.

        NOTE:
        • Do not release the activation prevention mechanism unless specially directed by the troubleshooting procedure.
        • To prevent the terminal and the short spring from being damaged, always use a piece of paper with the same thickness as the male terminal.
        Fig 4: Identifying Connectors
        GTY299741Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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