How do I get my 1999 Buick lesabra to start if the security light is on

You need to be towed to your local GM Dealer for repairs. Hope that helps! Jim

This is a very common problem on GM vehicles. The security system is notoriously known to fail. Basically when you insert your key, the system checks for a certain signal. If the system cannot get the correct signal from the key, it assumes the key is incorrect or you are attempting to hotwire it. The system then goes into SECURITY lockout mode. (prevents vehicle theft) This will either turn off the starter, or the fuel injectors. This has been happening with GM's for a very long time. There is a company called Newrockies inc. that sells a bypass for this online. Works great.