Front Driver Side Air Bag Inflator problems of the 2004 Nissan Armada

Takata inflators pasanger sit dosent sense theres a person on the sit airbag is off all the time even when driving and there's a adult heavy person on the sit I've tried several friends heavy persons and it's always off even when driving any speed . . . . . Rear brakes don't work properly when driving in regular street 25 milles suddenly emergency light turns on and back breaks sound like they are loose and don't stop car had to turn car off in the middle of street and then turn it on to reset brakes and then it works fine for a day or 2 or a week not sure when but its very often.