I have a 2016 base and mine does not beat at all. I have seen them beat since my GF has an XF and hers does the heart beat in fact I pointed it out to her a couple of years ago.

kind of miss it.

 

I have sat in my completely dark garage and cannot get my start button to "beat". I can clearly see it light up, and stay lit. I can also see when it's not lit, but door open, door closed, foot on brake, foot off brake, "ignition" on or off, nothing makes it "beat". It's simply "ON"

 

Paraphrasing "cogito ergo sum", mine [2015 V6S] beats, therefore I am.

 

I knew i should have ordered the defibrillator option!

 

As long as the damned thing fires up when I push the button, I'm good to go!