S60 AWD L5-2.5L Turbo VIN 59 B5254T2 (2005)
Under normal conditions the information from the occupant weight sensor (OWS) system (7/93) is the basis for whether the supplemental restraint
system module (SRS) (4/9) should activate or deactivate the front passenger airbag (8/31 8/32 and 8/124). The occupant weight sensor (OWS)
communicates continuously with the supplemental restraint system (SRS) module on the local LIN bus. When a passenger weighing more than a certain
weight is in the seat, the supplemental restraint system module (SRS) is informed by the occupant weight sensor (OWS). The control module software
activates the front passenger airbag, which means that the airbag has full functionality in the event of a collision. At the same time the supplemental
restraint system module (SRS) transmits a signal on the controller area network (CAN) to the upper electronic module (UEM) (4/70), with a request to
switch off the passenger airbag disconnected warning lamp. The upper electronic module (UEM) then switches off the passenger airbag disconnected
warning lamp.
If the weight on the front passenger seat is below a certain level the supplemental restraint system module (SRS) is informed by the occupant weight
sensor (OWS). The control module software deactivates the front passenger airbag, which means that the airbag has no functionality in the event of a
collision. At the same time the supplemental restraint system module (SRS) transmits a signal on the controller area network (CAN) to the upper
electronic module (UEM), with a request to switch on the passenger airbag disconnected warning lamp. The upper electronic module (UEM) then lights
the passenger airbag disconnected warning lamp. However there is an exception to this:
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The passenger airbag disconnected warning lamp will remain unlit if the occupant weight sensor (OWS) registers that the passenger seat is
unoccupied. This means that the passenger airbag is deactivated.
NOTE: The on/off switch for the front passenger airbag and occupant weight sensor (OWS) must not be installed in the vehicle together.
The occupant weight sensor (OWS) system (USA/CDN - certain models only)
The occupant weight sensor (OWS) is designed to meet the regulatory requirements of Federal Motor Vehicle Safety Standard (FMVSS) 208 and is
designed to disable (will not inflate) the passenger's side front airbag under certain conditions.
The occupant weight sensor (OWS) works with sensors that are part of the front passenger's seat and safety belt. The sensors are designed to detect the
presence of a properly seated occupant and determine if the passenger's side front airbag should be enabled (may inflate) or disabled (will not inflate).
The occupant weight sensor (OWS) will disable (will not inflate) the passenger's side front airbag when:
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the front passenger seat is unoccupied, or there are small/medium objects in the front passenger seat
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the system determines that an infant is present in a rearfacing infant seat that is installed according to the manufacturer s instructions
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the system determines that a small child is present in a forward-facing child restraint that is installed according to the manufacturer's instructions
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the system determines that a small child is present in a booster seat
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a front passenger takes his/her weight off of the seat for a period of time
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a child or a small person occupies the front passenger seat.
The occupant weight sensor (OWS) uses a passenger airbag warning lamp (PAD) which will illuminate and stay lit to remind you that the passenger's
side front airbag is disabled. The passenger airbag warning lamp (PAD) is located in the interior rear view mirror.
NOTE: The passenger airbag warning lamp (PAD) will illuminate for a short period of time when the ignition is turned on to confirm it is functional.
When the front passenger seat is not occupied (empty seat) or in the event that the passenger's side front airbag is enabled (may inflate), the passenger
airbag warning lamp (PAD) will be unlit. The occupant weight sensor (OWS) is designed to disable (will not inflate) the passenger's side front airbag
when a rear facing infant seat, a forward-facing child restraint, or a booster seat is detected. The passenger airbag warning lamp (PAD) will illuminate
and stay lit to remind you that the passenger's side front airbag is disabled.
NOTE: Volvo recommends that children always be properly restrained in appropriate child restraints in the rear seats.
In rare situations when the safety belt is not latched, some child restraints may not be detected by the OWS because there is very little weight on the
vehicle seat cushion. In these cases the passenger's side front airbag may be disabled, but the passenger airbag warning lamp (PAD) will not be lit. Do
