Dear latio bros, PROBLEM SOLVED!
Thanks to Silver, I checked the rear view mirror and true enough, the wire behind was not securely attached. I pushed the head of the wire back in and lo and behold, Intelligent-Key again! Thanks again Silver! And luckily enough, I hadn't made my way down to TC yet and I'm still using my Energiser CR2025.
If like me, you share the car with your family members and keep adjusting the mirror and also use a reflector which u typically shove behind the mirror, you might wanna do the same.