The inflatable curtain, Inflatable Curtain (IC), helps to prevent the driver and passengers from striking their heads on the inside of the vehicle during a collision.
The inflatable curtains are installed along both sides of the inside of the roof and help protect occupants in the vehicle's outer seats. IC Airbag is embossed on the panels.
A collision of a sufficiently violent force will trigger the sensors and the inflatable curtain will inflate.
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A quick Volvo XC90 quiz: every answer comes with an explanation and a link to the manual page.