Activating/Deactivating Front Passenger Airbag (Only USA/CDN)

Fig 1: Identifying Activating/Deactivating Front Passenger Airbag (Only USA/CDN)

Courtesy of VOLVO CARS OF NORTH AMERICA.

In normal conditions it is the information from the Occupant weight sensor (OWS) (7/93) that is the basis for if the Supplemental restraint system module (SRS) (4/9) shall activate or deactivate the front passenger airbag (8/31 and 8/32). Occupant weight sensor (OWS) communicates continuously with Supplemental restraint system module (SRS) on the local CAN-network. When a passenger is seated, with a weight exceeding a certain level, in the passenger seat the Occupant weight sensor (OWS) will inform the Supplemental restraint system module (SRS) about this. Then the control module's software activates the front passenger airbag, which means that the airbag has full function in case of a collision. At the same time, the Supplemental restraint system module (SRS) sends a signal on the CAN-network, to the central electronic module (CEM) (4/56), with a request that the warning light passenger airbag (PAD) shall be turned off. Then the Central electronic module (CEM) turns off the warning light for passenger airbag (PAD).

If the weight in the front passenger seat is below a certain level the Occupant weight sensor (OWS) will inform the Supplemental restraint system module (SRS) about this. Then the control module's software deactivates the front passenger airbag, which means that the airbag remains inactive in case of a collision. At the same time, the Supplemental restraint system module (SRS) sends a signal on the CAN-network, to the central electronic module (CEM), with a request that the warning light passenger airbag (PAD) shall be turned on. Then the Central electronic module (CEM) turns on the warning light for passenger airbag (PAD). However, there is one exception:

• 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.