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Hello. Welcome to Just Answer. Please allow me to assist you. If the vehicle has the FACTORY alarm system installed, the sequence is to get into the vehicle, turn the key form off to on (where the instrument cluster warning lights illuminate), then back off. Repeat this on-off sequence 4 more time.s So, in short (again, if this is the FACTORY system), you cycle the key from OFF to On, then On to Off 4 times (on/off on/off on/off on/off on/ff ). Leave 1 second between each movement of the key. After the 5th cycle, try to start. If this vehicle does not have the factory system, this will not work.