I have been having this problem for some time now, and I have changed the ignition key cylinder but to no avail. I can reset the security but doing the 10 minutes on 5 seconds off routine but that is getting old and my wife drives this blazer and I do not want her to be stranded somewhere at night. Read the by-pass articles and watch the you tube ones too but not comfortable trying that. Any help would be appreciated. Thank you.