what would cause the air bag service light to come on and the car not to start?

2003 CADILLAC CTS
151,440 MILES
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MATTSCALF81
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fuses are good battery is good, before it was saying service theft system so I changed the ecm fuse it ran good til I hit a bump. It said service air bag, I checked the fuses.it would start at first but now it wont crank at all.
Sep 19, 2012 at 11:07 PM
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KHLOW2008
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Most likely a connection somewhere is loose or you have a blown fuse causing the security system to be triggerred.
Sep 19, 2012 at 11:25 PM
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KHLOW2008
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Check for a bad ground circuit as well.
Sep 19, 2012 at 11:26 PM
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