The driver knee airbag is under or within the instrument panel. During a crash, the restraints control module may activate the knee airbag based on crash severity and respective occupant conditions. Under certain crash and occupant conditions, the knee airbag may deploy but the corresponding front airbag may not activate. 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