I recently bought an 04 plate nissan Micra and tonight was unable to unlock the car with the electronic key. I had the battery changed and it still did not work... after much investigation i found the manual key lock on the passenger door which allowed to me to get in but am concerned as to why my key failed even after changing the battery. Since i bought the car everytime i have got in there has been a small red light flashing on the dashboard..its the shape of a car with a key in the middle... i was told this meant the car was unlocked with the engine turned off but am now thinking it may be trying to tell me something is wrong with the central locking... i didn't get the book with it and cannot find one online..can anyone help!?!?