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In addition to airbag deployment and impact severity, the Vehicle Comm and Interface Module can also record whether you're wearing your seatbelt or how fast you're driving. It keeps data related to events immediately before, during and after a crash for about 45 days. The Call Center retains received information for over a year so that it can maintain quality and follow-up on customer complaints.
OnStar says that it passes this information on to auto manufacturers to improve vehicle safety. However, critics speculate that it could also be used to:
clear auto manufacturers of wrongdoing
deny warranty repairs
find you at fault in an accident
increase your car insurance premiums or change your coverage