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The 2003 Pontiac Grand Prix does come with a factory security system installed. If your security system is enabled it should have a "security" light that flashes when the key is turned on.
The security light flashes when a programed key is not installed in the ignition, when you insert a programed immobilizer key in the ignition the security light will go out, the light flashes as a theft deterrent
A flashing Security light is indicating that the security system on your car is active.
When you turn the key off and lock the doors, there will be a red light on the top of the dash that flashes while the alarm arms.
This usially means the system in control of anti-theft (via the black block on your key) is inoperable and is being bypassed.
check to see if your security light is on i had the same problem (they all do ) put your key in the "on " postition and leave it for 10 minutes until the security light flashes off and then start your engine.
How. Do reset airbag light on a 1993 grand marquis
flashes of light
A flashing check engine light normally means you have a misfire.
it is the key if you go get the replcement key car will start
1992 nissan maxima security light flashes when open door and car is not starting cranks well, cleaned battery terminals.
depending on the year you can disconnect the positive battery cable for a few minutes and then reconnect it. it may reset the security system.