A driver's knee airbag is located under the instrument panel. During a crash, the restraints control module may activate the driver's knee airbag based on crash severity and occupant conditions. Under certain crash and occupant conditions, the driver’s knee airbag may deploy but the driver’s front airbag may not activate. As with front and side airbags, it is important to be properly seated and restrained to reduce the risk of death or serious injury.
Airbag  Make sure the knee airbag is operating properly.   See   Crash Sensors and Airbag Indicator