The central airbag control unit is mounted on the tunnel under the centre console and contains sensors for triggering the airbag. Up to six satellite airbag sensors are located at points where signal flows intersect and work in conjunction with the central control unit to ensure that the occupant restraint system are activated appropriately and in time. The airbag are triggered when the system measures a rate of vehicle acceleration or deceleration higher than the rate programmed in the control unit. If the acceleration or deceleration does not exceed the system’s programmed rate, the system will not deploy.