Front Air Bag Sensor Control problems of the 2009 Subaru Outback

The red light on the dashboard (where the speedometer is) for driver's air bag comes on when the temperature goes below about 44 degrees. It stays on 95% of the 8 winter months. I bought this used (2014) from a dealer, and told the service manager about it. He said unless it comes on 100% of the time, then dont worry about it. I came back 1 time and complained again, hoping a "sensor check" might be covered since I had bought the extended warranty on it. He again said "dont worry about it. " -- the passenger red light on the overhead box also stays on all the time. It does not flash or beep unless I have some heavy boxes on the seat, so I ignore it. I am just worried that neither air bag will work in an emergency. I cannot get an answer (or search) that answers that. It is frightening. When the car is started, and when moving, this happens. Only shutting the car off shuts off the light. Speed, movement or street does not affect it. It does not flicker; it stays on.