Occupant Classification System Diagnosis System

Vehicle Interior. Corolla. Zre142 Aze141
Supplemental Restraint Systems. Corolla. Zre142 Aze141

  1. CHECK DLC3

  1. SYMPTOM SIMULATION

  1. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR

Occupant Classification System -- Diagnosis System



CHECK DLC3

  1. Check the DLC3 (COROLLA_ZRE142 RM000000UZ20CBX.html).


SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and the environment in which the problem occurred in the customer's vehicle should be simulated. No matter how experienced or skilled a technician may be, if he/she proceeds to troubleshooting without confirming the problem symptoms, he/she will likely overlook something important and make a wrong guess at some points in the repair operation.
This leads to a standstill in troubleshooting.


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System.Occupant Classification System Diagnosis System

  1. VIBRATION METHOD: When a malfunction seems to occur as a result of vibration.

    HINT:
    Perform this simulation method only during the primary check period of approximately 6 seconds after the ignition switch is turned to ON.

    1. PARTS OR SENSORS
      Apply slight vibration with a finger to the part or sensor suspected to be the cause of the problem, and check whether the malfunction occurs.

      NOTICE:
      Applying strong vibration to relays may open the relays.

    2. CONNECTORS
      Slightly shake the connector vertically and horizontally.

    3. WIRE HARNESS
      Slightly shake the wire harness vertically and horizontally.

      HINT:
      The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR


  1. Initial check

    1. Turn the ignition switch to ON.

    2. The passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then goes 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 or OFF depending on the conditions listed below.

      Front Passenger Seat Condition
      		Passenger Airbag ON/OFF Indicator
      		SRS Warning Light
      ON indicator
      		OFF indicator
      Vacant
      		OFF
      		OFF
      		OFF
      Adult is seated.
      		ON
      		OFF
      		OFF
      Child is seated.
      		OFF
      		ON
      		OFF
      Child restraint system is set.
      		OFF
      		ON
      		OFF
      Front passenger occupant classification failure
      		OFF
      		ON
      		ON
      HINT:
      1. The passenger airbag ON/OFF indicator is based on the timing chart below in order to check the indicator light circuit.
      2. 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 the airbag system first.

      Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System.Occupant Classification System Diagnosis System


CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    Corolla. Zre142 Aze141.Supplemental Restraint Systems.Airbag System.Occupant Classification System Diagnosis System

  1. Turn the ignition switch to ON.

  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 to ON and approximately 6 seconds pass.