Question about 1999 Mercury Grand Marquis

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Anti-theft system I have a 1999 Grand Marquis, One Day it wont start.security light is blinking every 2 seconds, indicating security system is activated, my owners manual says if i have the 2 keys that i can reprogram them myself,and i have them and thats where it dosnt tell me anythig else. Thanks

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You have to have 2 keys that are already programed in order to program another key. The procedure is cycle 2 programed keys in the ignition switch one at a time pausing 3 secs each time in the run position or until the antitheft light proves out.Then cycle an un-programmed key for 3 secs and the same for any addition key.It will have a limit of 8 keys.
If you do not have 2 already programmed keys then you have to have a scan tool that will perform security access and key programming.

Posted on Mar 10, 2009

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You will have to take to the dealer an have the PATS system reset , need factory scan tool to do it . PATS - passive anti-theft system .

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TRY REPROGRAM KEY .PUT KEY IN IGNITION SWITCH TURN IGNITION SWITCH ON POSITION 20 SECONDS DONT START ENGINE WAIT 20 SECONDS TURN OFF SWITCH THEN TURN SWITCH BACK ON 20 SECONDS WATCH THE THEFT SECURITY LIGHT BLINKING.WHEN THEFT STOP BLINKING VECHICLE WILL CRANK.IF LIGHT STILL BLINKING.TRY FEW MORE TIMES KEY IN SWITCH ON POSITION FOR 20 SECONDS.MAKE SURE YOU HAVE THE CORRECT CAR KEYS IN SWITCH IF NOT WRONG SET OF CAR KEYS WILL SET OFF THEFT SECURITY SYSTEM.IF KEY RESETTING TRICK DONT WORK.CHECK BATTERY POWER MAKE SURE YOUR BATTERY HAS 12.5 VOLTS AND CHECK SECURITY THEFT FUSE.IF ALL LOOKS GOOD YOUR SECURITY HAS TO BE CHECKED OUT AT THE DEALERSHIP.

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If you have a security issue a code should be stored for it. This would of told you what system is the problem. Not all code readers will pick up security codes so don't rely on your autoparts code reader to be accurate.

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