Went to Tesco last night locked the car with the key fob and when I came back to it tried to unlock it with the key fob but it didnt. Opened the car with the key but didnt have the small red flashing light on the dashboard but put key in and had full electrics radio, fan etc. Is it simply my battery in the key fob is dead or is it something else as had to get the car recovered and tried spare fob at home but no joy. 2002 civic