Q: security light came on can not get it off. on 2002 Chevrolet Silverado 1500

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was driving yesterday when the security light came on. truck is a 2002 Chevy 1500 4.8 liter regular cab long bed 4 wheel drive. all the head lights wont turn on either. The truck will start just fine thou. I have tried disconnecting the battery to reset it did not work. Also tried the 30 min session where you turn the key so it is almost on and wait 10 min doing that three times before starting it(suppose to over right it) did not work I have looked in the owners manual and it has nothing there to help me. thanks to anyone with any help
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