Can anyone provide instructions as to how to open the smart key unit for battery replacement? The car is an '11 Sonata. I found the slots on each side. Is there a secret? Are there instructions? Many thanks!
Use the right size screw head (similar to the slot size) and it will pop open when you twist the screw driver. I tried a smaller head (.250") and it didn't work. I used the one that's .375" wide. So, if I were you, I will try
to find a flat-head that's at least .350" wide. Good luck!