Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2009COROLLA S, 1.8 U, STANDARDREPAIR AND DIAGNOSISRESTRAINTSAIR BAG, SRSSUPPLEMENTAL RESTRAINT SYSTEMOCCUPANT CLASSIFICATION SYSTEMSYSTEM DESCRIPTION
2009 Toyota Corolla S, 1.8 U, Standard
System Description
2009 Toyota Corolla S, 1.8 U, StandardSECTION System Description
- GENERAL DESCRIPTION
- In the occupant classification system, the occupant classification ECU calculates the weight of the front passenger based on a signal from the occupant classification sensor. This system judges the occupant to be a child, and disables the front passenger airbag and front seat side airbag RH.
- This system is mainly composed of the occupant classification sensor that detects the load on the front passenger seat. The occupant classification ECU controls the system, and the passenger airbag ON/OFF indicator indicates the ON/OFF condition of the front passenger airbag and front seat side airbag RH.
- OCCUPANT CLASSIFICATION SENSOR
- The occupant classification sensor consists of the gel mat and the pressure sensor.
When weight is applied to the gel mat, the pressure applied through the silicone to the pressure sensor changes. The pressure sensor converts these changes into voltages and transmits them to the occupant classification ECU.
- The occupant classification sensor is installed between the seat cushion frame and seat cushion pad. The pressure sensor is installed on the seat frame.
- The pressure sensor detects the pressure applied to the front passenger seat as a seated passenger. The occupant classification ECU determines whether the front passenger airbag and front seat side airbag RH are deployed based on signals from the pressure sensor.
- The occupant classification sensor consists of the gel mat and the pressure sensor.
- SEAT BELT TENSION SENSOR
- The seat belt tension sensor is installed on the front seat outer belt to detect a CRS (Child Restraint System).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.