How to open the side cart from a link on my header

Hi, I am looking to have the side cart open when the checkout page is clicked on my menu header. I followed the tutorial to get the code for the menu cart icon, and that worked great. I tried the same technique for the “Checkout” on the menu header, but it still routes to the default checkout page instead of opening the side cart. Can you please help me with the proper way to do this. Thank you.