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Q: computer issue? on 2005 Hyundai Tiburon

Complete system shut down by vehicle while driving at hyway speeds. 3000 dollars later (timing belt, cylinder carbon clean out) experieced second complete shutdown. Lost control, overturned, hit embankment. Air bags did not deploy. Does this not indicate a computer issue? Are airbags controled by the main computer?
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Airbags deploy or don't deploy for many reasons. For the bags to deploy the front sensors need to sense impact from a certain angle. A different computer deploys the air bags that that which controls the fuel injection and ignition system. Hyundai as a car manufacturer put a lot of free technical information and workshop manuals on line for Hyundai owners. Check out lots of great information.
First, how terrible an experience, I hope that you were not severely injured.

Now - the car -- I anticipate the stall this time was caused by a lack of electrical power. A lack of electrical power will not allow the air bag sensors to function, after a fairly short period of time. If the air bag system lost electrical power, and there was a collision, the bags would not deploy.

AIr bags are not controlled by the engine's computer, but rather a module specifically for the air bags.

I suspect a battery and charging system failure of some kind.
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