Hi. I just bought a 2001 sentra SE with the P/P. When I arm the alarm and lock the doors with the clicker, the little red light on the dashboard goes solid red. I opened the car with the key without disarming the system and the alarm didnt sound and the little light started blinking like when the system is disarmed. If I press the panic button, the alarm sounds. I have tried rocking the car with the alarm armed, and leaving a window open after arming it and opening the door, but it seems nothing will make the alarm sound. Is this normal or is there something wrong?