A controller for a vehicle includes a processor and a memory storing processor-executable instructions. The processor of the controller is programmed to receive a side-impact signal representing a collision to a side of the vehicle, receive an occupancy signal indicating that a first rear seat of the vehicle is occupied, and send an output control signal to deploy an airbag between a front seat adjacent the side of the vehicle and a second rear seat adjacent the side of the vehicle in response to the side-impact signal and the occupancy signal only when the second rear seat is unoccupied.