Hyundai Sonata: Air Bag - Advanced Supplemental Restraint System / Occupant Classification System (OCS)

Your vehicle is equipped with an Occupant Classification System (OCS) in the front passenger's seat.

Main components of the Occupant Classification System

The OCS is designed to help detect the presence of a properly-seated front passenger and determine if the passenger's front air bag should be enabled (may inflate) or not.

The purpose is to help reduce the risk of injury or death from an inflating air bag to certain front passenger seat occupants, such as children, by requiring the air bag to be automatically turned OFF.

For example, if a child restraint of the type specified in the regulations is on the seat, the occupant classification sensor can detect it and cause the air bag to turn OFF.

Front passenger seat adult occupants who are properly seated and wearing the seat belt properly, should not cause the passenger air bag to be automatically turned OFF.

For small adults it may be turned OFF, however, if the occupant does not sit in the seat properly (for example, by not sitting upright, by sitting on the edge of the seat, or by otherwise being out of position), this could cause the sensor to turn the air bag OFF.

You will find the "PASSENGER AIR BAG OFF" indicator on the center facia panel. This system detects the conditions 1-4 in the following table and activates or deactivates the front passenger air bag based on these conditions.

Always be sure that you and all vehicle occupants are seated properly and wearing the seat belt properly for the most effective protection by the air bag and the seat belt.

The OCS may not function properly if the passenger takes actions which can affect the classification system. These include:

Condition and operation in the front passenger Occupant Classification System


Riding in an improper position or placing weight on the front passenger’s seat when it is unoccupied by a passenger adversely affects the OCS. To reduce the risk of serious injury or death:

• NEVER put a heavy load in the front seat or seatback pocket, or hang any items on the front passenger seat.

• NEVER place your feet on the front passenger seatback.

• NEVER sit with your hips shifted towards the front of the seat.

• NEVER ride with the seatback reclined when the vehicle is moving.

• NEVER place your feet or legs on the dashboard.

• NEVER lean on the door or center console or sit on one side of the front passenger seat.

• Do not put an electronic device (ex. Laptop computer, after market DMB, navigation, satellite audio, video game machine, MP3, AC inverter, etc.) in the front passenger seatback pocket or on the front passenger seat.

• Do not place a sitting mat on the front passenger seat.

• Do not place any items under the front passenger seat.

• Do not place sharp objects on the front passenger seat. These may damage the occupant detection system, if they puncture the seat cushion.

• Avoid spilling liquids on the front seat; this may cause the OCS not to work properly. Keep the front seat dry at all times.

Proper seated position for OCS

If the "PASSENGER AIR BAG OFF" indicator is on when an adult is seated in the front passenger seat, place the ignition switch in the LOCK/OFF position and ask the passenger to sit properly (sitting upright with the seat back in an upright position, centered on the seat cushion with their seat belt on, legs comfortably extended and their feet on the floor). Restart the engine and have the person remain in that position. This will allow the system to detect the person and to enable the passenger air bag. If the "PASSENGER AIR BAG OFF" indicator is still on, ask the passenger to move to the rear seat.


Never allow an adult passenger to ride in the front passenger seat when the "PASSENGER AIR BAG OFF" indicator is illuminated. During a collision, the air bag will not inflate if the indicator is illuminated. Have your passenger reposition himself in the seat. If the "PASSENGER AIR BAG OFF" indicator remains illuminated after the passenger repositions himself properly and the vehicle is restarted, have the passenger move to the rear seat because the air bag will not inflate.


The "PASSENGER AIR BAG OFF" indicator illuminates for approximately 4 seconds after the ignition switch is in the ON position or after the engine is started. If the front passenger seat is occupied, the OCS will then classify the front passenger after several more seconds.

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