Requirement: Change Subsite logo to link root site in SharePoint 2013 / SharePoint 2016

Solution: By default, Subsite logo links points to its homepage. We can change site logo link in SharePoint 2013 using jQuery to point to root site.

sharepoint 2013 logo link to root

Add a script editor or modify your master page to include this code

<script src="https://code.jquery.com/jquery-3.1.0.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
  $("#DeltaSiteLogo a").attr("href","http://intranet.crescent.com/");
});
</script>

Here is my another post with different approach: Change SharePoint 2013/2010 Site Logo Link to Root Site URL

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