Activating/Deactivating The Front Passenger Airbag (not USA/CDN)

Fig 1: Identifying Front Passenger Airbag Activation / Deactivation Communication Links & Components

Courtesy of VOLVO CARS OF NORTH AMERICA.

If necessary, the front passenger airbag (8/31 and 8/32) can be deactivated. This is done using a switch (3/157) positioned on the side of the dashboard on the passenger side.

If the position of the switch is changed from "on" to "off", the level of current at the two Hall sensors connected to the switch changes. The Hall sensors transmit the altered current levels to the supplemental restraint system module (SRS) (4/9) via directly connected cables.

The control module software deactivates the front passenger airbag, which means that the airbag has no functionality in the event of a collision. 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 light the passenger airbag disconnected warning lamp. The upper electronic module (UEM) then lights the passenger airbag disconnected warning lamp.

When the position of the switch is changed from "off" to "on", a new current level is transmitted from the Hall sensors to the supplemental restraint system module (SRS). The control module software then activates the 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), 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.