Buick 2007 Terraza Owner's Manual page 80

If your vehicle has a side impact airbag for the
driver, it is in the side of the driver's seatback
closest to the door.
80
If your vehicle has a side impact airbag for the
right front passenger and/or the second row
captain's chairs (if equipped), it is in the side of
the seatback closest to the door.