My car just started to have the airbag light on all the time an when that happened the window stoped working an so did the heat what could be wrong with the car

Hello, That is going to be difficult to diagnose. The problem is likely a chaffed wire somewhere, and finding it will be problematic since it seems like the issue is intermittent. My advice is to consult a technician for diagnosis, and if they cannot identify the source of the problem due to the intermittent nature of the problem, just wait until the issue occurs all the time.