If the security light is flashing while you are trying crank the engine over the alarm system is cutting the starter/engine run operation. Did you have the new key initialized before or after installing it? Each key has its own RF chip in it try to hold the old key next to the new key while it is in the ignition to see if that makes a difference.
Pleas let me know, Ken
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Sunday, August 12th, 2018 AT 12:30 PM