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Originally Posted by Hummer Guy
I think we may be talking about two different things. After I posted I double checked an on-star pamphlet - It was not a Hummer specific brochure but it didn't make mention that it was only on specially equiped vehicles. Under the services provided it listed: "Advanced Automatic Crash Notification - An advisor can call for help if the vehicle is involved in frontal, rear, or side impact crashes - regardless of airbag deployment." f5 you can probably tell us more about this system - if there aren't sensors, is it something that takes other measurable data and makes assumptions about crashes?
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Yes, the SDM has a program known as near deployment. Basically it is a program where the SDM considered blowing the bags due to a sensor or its own microprocessor, but stopped short of actually blowing the bag.
The SDM is the primary device for measuring and making decisions for frontal collisions. For side impacts, it is primarily the sensor(s).