Air bag light came on , passenger light goes on and
off when someone sits and gets out,so that sensor
works right,why does the driver side need a sensor,
there will always be a driver,is there a sensor under
the driver and is that the problem
Hard to say, air bag systems have their own set of codes, so I would get the air bag codes and go from there, the air bag light is on so there is a code. The most common failure on all air bag systems is the clock spring unit that sits right behind the steering wheel, but get the codes, don't just start throwing parts on it hoping you might get lucky.
the srs has to be looked at periodically to make sure it is still operational- it is just regular maintenance-
Search Hummer H3 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Hummer H3 Experts