Usually even after market immobilisers have a number on the back of a card that your given upon instalation of, if remote doesn't work follow instructions, usually is a trick of turn key on and count flashes of led for ex amount, turn key off, and so on until your ignition is able to be switched on. Far as just your remote, sometimes when the car battery is dead the immobaliser won't switch off properly, I had this on an earlier car of mine. Hope that helps.