I had to replace my 2005 wrx car battery today and since then the alarm does not seem to be working. I have the genuine Subaru SA1046 Dual Stage Security Alarm and now when I lock and then unlock the car it does not ask me for my code. Once the car is unlocked the keypad sits with the number 1 highlighted. The car still works but I am assuming the immobilizer is not functioning. Does anybody know what I have done OR how to fix?