Smart Key won't start the car

Both my smart keys won't start my car - they won't even lock or unlock the doors.

I replaced the batter in each key, but still nothing.

When put the key, depress the brake, and push the start button - nothing.

Any thoughts/suggestions as to what is causing this?

Thanks

 

THanks,

Maybe 'smart key' is the wrong term as I don't recall every seeing or having that button under the stearing wheel

 

yes, both keys always worked fine (bought the car new off the lot) - a couple of weeks ago, now that I recall, one key, when you got close to the car made the alarm go off. then just a couple of days ago, both keys just didn't work

 

I'll check for th SKS button - I don't recall there being one. I recall there's a button for what looks like a tire, but not for the keys.

I've not checked the 12 volt.

 

No key in pocket, nor touch door handle to lock and unlock -

 

Sorry, may be the smart key term is not correct - that's the only one I am aware of.

I don't have an automatice start (key in pocket) nor do I have touch locks.

I insert the key, push the start button to start my car; and clock the lock and unlock on the key.

Now, when I insert the key, depress the brake, push the start button - nothing happens. The keys have worked this way since bought the car.

 

Yes, 12v is original.

The hybrid battery, on the other hand, I had to replace about two years ago.