Chevrolet 2010 Impala Owner's Manual page 90

Driver Side shown, Passenger Side similar
The seat-mounted side impact airbags for the driver and
right front passenger are in the side of the seatbacks
closest to the door.
2-60
Driver Side shown, Passenger Side similar
The roof-rail airbags for the driver, right front passenger,
and second row outboard passengers are in the ceiling
above the side windows.