CHEVROLET IMPALA SECURITY

All My Gauges And The A/​c Does Not Work, And It Says Anti-theft De­ter­rent.

Had To Change The Ig­ni­tion Cy­clin­der And Got New Keys. Now Se­certy Light Is On And Car Won't Start.

I Can­not Start My Ve­hi­cle Be­cause The Se­cu­rity Will Not Dis­able. What Can I Do To Dis­able The Se­cu­rity Sys­tem And Use My Car