security light wont stop flashing,when doing the relearn on 1999 Chevrolet S10

i try to start truck,it starts and then stalls and the security light starts flashing.(3 regular flashes,then two quick).i wait ten minutes,light still flashes,i wait up to ten more,still flashes. so i cant move on to next step. i have tried this several times,but wont stop flashing. i have looked up the relearn proceedure several time to make sure im do it right. im beyond fustrated, any help would be great. thanks

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