a/t light is on and security light is blinking rapidly
 

Ok so I have a 2008 mazda3 2.0L with a auto trans, So my problem is that my A/T light is on, security light is rapidly blinking.
So when I get into my car and put the keys into my ignition and turn my key everything lights up as it supposed too. But it does nothing completely nothing, So I went ahead and tried to put my OBDll scanner to see what my problem is, and the only thing y scanner says is that my ECU isn't communicating. I've checked all fuses, and they got power. checked relays for power, and yes they all have power.
I'm so confused on what's going on.
so I've done research and from my understanding my immobilizer has been activated. But how the hell do I get it to turn off, I've looked up and tried everything I've been able to find on google to reset my immobilizer and nothing seems to work, if someone out here could PLEASE help me out with pointing me in the right direction on what to do or how to go about fixing my issue it would be greatly thankful.
This vehicle is the only car i have for my family of 4 and its really putting a dent into my everyday without it again thank you if you can