The manual should tell you where the sensor's are and how/when they're deployed if hit...
but in any case, i'd have your chest checked out for bruised ribs and documented for future reference. you never know - sometimes those bruises or what not really come into effect weeks later (similar to neck and back pain) and chest pain like that can take a long time to heal...
not only that, but you could get a traffic accident analyst to check out your case - they'd be able to tell you whether or not the airbags should have deployed and what/who was really at fault - the other driver, or the municipality (city/county) for sight distance in the intersection, the signal or the intersection geometrics itself. I'm not sure what they charge citizens though cuz insurance companies & traffic engineers usually use them for accident lawsuits (expert witness testimony). If you do decide to check out the intersection records, the accident records are public information and if there have been a lot of accidents in the past 3 years at that intersection (say over 10 injuries and/or 5 fatalities) - you can do something about it by talking to the city/county engineer (whoever has jurisdiction).
sounds like the other driver wasn't paying attention (misjudging distance for the turn) or the city/county may be at fault since the sight distance at the intersection may have been poor depending on how many trees/shrubs are around that area, how grown they are (if they'd been trimmed by the city recently), if signs were in the way of sight, and if there's a curve in the road before/after the intersection, that could play a factor as well. Many times, it's human error that plays into it, but it's also based on whether the intersection was designed for safety or not - unfortunately, most aren't since there's nothng yet to compare safety levels except for a software called Traf-SAFE (
www.trafficsafetysoftware.com or
www.trafsafe.com) and there aren't any municipalities that are using it yet - we're still trying to get it out there and recognized but it predicts intersection safety to a 98% accuracy, which means less injuries and less fatalities overall...
probably more information than you wanted! haha but hey - it always helps to plug a good product!!