how do I reset the security system for my van? on 2001 Chevrolet Venture

replaced fuel pump/filter, now van won't start. getting spark and fuel to engine. someone said that the security system needs to be re-set, but unsure of correct sequence of events needed in order to do so.

Asked by for the 2001 Chevrolet Venture
dis connect battery for a few minutes. be sure to coat terminals with petroleum jelly before re connect.