How do I turn off a flashing anti theft light?

Will not crank how ? What happens when you turn the key to the start position ? Nothing or the engine spins around ? Does the security light flash fast ? anti-theft system problem . Anti-theft system problem will keep the engine from cranking .

Your vehicle has two theft systems - content theft , if the door is opened without the key or keyless entry key fob the horn honks lights flash . PATS - passive anti-theft system ,this keeps the vehicle from starting if the computers don't see the right code from the transponder pellet in the head of the key .
You can turn off the content theft but not the PATS , when trying to start the vehicle does the theft light flash fast ? Red light on top of the dash .

Ford's PATS anti-theft system disables the starter from spinning the engine . Flashing real fast while trying to start the vehicle means the vehicle see's wrong key code ,think's the vehicle is being stolen . Code's stored in the computer , FORD dealer , nothing you can or should do .

Car Won't Start Because of Anti-Theft System ... - RepairPal

repairpal.com > Problems > Oldsmobile > 88

Car Won't Start and Security Light is On on Oldsmobile 88 ... key turns over enginebut fails to start some times..security system keeps the fuel injectors from ...

Car Won't Start Because of Anti-Theft System ... - RepairPal

repairpal.com > Problems > Buick > LeSabre

Car Won't Start and Security Light is On on Buick LeSabre. Problems with the ... 1998 Buick LeSabreVisitor. Turn key on every thing come on but won't turn over.

Car Won't Start Because of Anti-Theft System ... - RepairPal

repairpal.com > Problems > Pontiac > Bonneville

Replaced trans, engine, PCM and bcm, now starter diabled- theft flashes on service ...1995 Bonneville car turns over but wont fire an security light is flashing car ...

GM Passlock Security Light Issues - RepairPal

What year and type of vehicle is it?

CHECK FOR LOOSE OR CORRODED CONNECTIONS TO THE BATTERY. TURN ON HEADLIGHTS OR BLOW THE HORN TO CHECK FOR BATTERY CHARGE. USE A VOLT METER TO SEE IF YOU HAVE 12 VOLTS AT THE BATTERY. ARE YOU IN PARK. THE NEUTRAL SAFETY SWITCH MAY CAUSE SUCH A CONDITION.

Red light flashing is probably anti theft. You may have an issue with your key

I’m happy to assist further over the phone at https://www.6ya.com/expert/josh_8f8ad0a8f7e0e6d3

Yes, keep it disconnected for at least 10 minutes. Also make sure your Battery is good. Sometimes the Anti-theft is sensitive to Battery voltage and will not connect the internal parts to allow a start.

If you have a Keypad, enter the Security Code on the Keypad and turn the Ignition Key within 5 to 10 seconds to start it.

You either have bad terminal connections on your battery or the anti-theft system has a system or sencor problem . I would really recomend that honda/acura check your electrical system and anti-theft system

You may have a faulty ingition. Otherwise you have the very common GM anti-theft system. If you have a flashing anti-theft light with key in igniton, then this is what you should do:

Put key in ignition, turn to ON position (Do NOT Start)
Leave in on position for EXACTLY 10 Minutes
Then while watching the anti-theft light, as SOON as the light turns off after 10 minutes, START CAR IMMEDIATELY after light turns off.

This will reset the anti-theft