Volvo 2005 S40 Manual page 13

bruises, swellings, or other injuries as a result of airbag(s) deployment.
When installing any accessory equipment, make sure that the SRS system is not damaged. Any interference in the
system could cause malfunction.
Never try to repair any part of the SRS or SIPS bag systems yourself. Any interference in the system could cause
malfunction and serious injury. All work on these systems should be performed by an authorized Volvo retailer.
pg. 19 Occupant Weight Sensor - disabling the passenger's side front airbag
Disabling the passenger's side front airbag
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 silicon-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.
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 above.
Occupant Weight Sensor (OWS) indicator light