Depending on the type of security system, it is sometimes necessary to re-sync the keyfob to the car after a flat battery on the car or the fob.
this is normally just a matter of turning the key to the IGN position and pressing the button on the key fob. you may have to hold the button for a second or two but this will normally re-sync the system.
if it does not work then you will have to sent more detailed information on the security system. ie factory fitted or aftermarket system with make and type (normally found on the siren unit under the bonnet.
hope this helps
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