Occupant Weight Sensor (OWS) indicator light
Disabling the passenger's side front airbag
Volvo recommends that ALL occupants (adults and children) shorter than four feet seven inches (140 cm) be seated in
the back seat of any vehicle with a front passenger side airbag, and be properly restrained for their size and weight.
See also the child safety recommendations on page 21
.
The passenger's side front airbag is automatically enabled/disabled by the Occupant Weight Sensor (OWS), a system
that monitors the weight of the person or object in the front passenger's seat. The system consists of a silicone-filled
bag located under the padding in the front passenger's seat cushion, a control module located under this seat, and a seat
belt tension sensor, located on the outboard side of the seat.
The OWS system continuously monitors the pressure on the front passenger's seat cushion and the tension applied to
the seat belt. Based on this data, OWS assesses the weight of the occupant or object in the front passenger's seat. This
information is transmitted to the SRS system control module, which enables or disables the passenger's side front
airbag accordingly, as indicated in the table to the right.
If the system is functioning normally, the status of the front passenger's side airbag (enabled/ disabled) will be shown
by the OWS indicator light as explained in the table to the right. The OWS indicator light is separate and in addition to
the SRS warning light in the instrument panel.
NOTE: When the ignition is switched on, the OWS indicator light will go on for up to 10 seconds while the system
performs a self -diagnostic test and then go out.
However, if a fault is detected in the system:
The OWS indicator light will stay on
The SRS warning light (see page 5) will come on and stay on
The message PASS. AIRBAG OFF SERVICE URGENT will be displayed in the information display.
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never be wrapped around an object on the front passenger's seat. This could interfere with the OWS system's
function. The front passenger's seat belt should never be used in a way that exerts more pressure on the passenger
than normal. This could increase the pressure exerted on the weight sensor by a child, and could result in the airbag
being enabled, which might cause it to deploy in the event of a collision, thereby injuring the child.
WARNING!
Never try to open, remove, or repair any components in the OWS system. This could result in system malfunction.
Maintenance or repairs should only be carried out by an authorized Volvo service technician. 'The front passenger's
seat should not be modified in any way. This could reduce pressure on the seat cushion, which might interfere with
the OWS system's function.
pg. 11 Occupant Weight Sensor (OWS)
WARNING!
Keep the following points in mind with respect to the OWS system. Failure to follow these instructions could
adversely affect the system's function and result in serious injury to the occupant of the front passenger's seat:
The full weight of the front seat passenger should always be on the seat cushion. The passenger should never lift
him/ herself off the seat cushion using the armrest in the door or the center console, by pressing the feet on the floor,
by sitting on the edge of the seat cushion, or by pressing against the backrest in a way that reduces pressure on the
seat cushion. This could cause OWS to disable the front passenger's side airbag.
Do not place any type of object on the front passenger's seat in such a way that jamming, pressing, or squeezing
occurs between the object and the front seat, other than as a direct result of the correct use of the ALR/ELR seat belt
(see page 21
).
No objects should be placed under the front passenger's seat. This could interfere with the OWS system's function.
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