functions.php

<?php

add_action( 'genesis_after_header', 'be_change_sidebar_order' );
/**
 * Swap Primary and Secondary Sidebars on Content Sidebar
 *
 * @author Bill Erickson
 * @link http://www.billerickson.net/switch-genesis-sidebars/
 */
function be_change_sidebar_order() {

  if( 'content-sidebar' !== genesis_site_layout() )
    return;
    
  remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
  remove_action( 'genesis_loop', 'genesis_do_loop' );
  add_action( 'genesis_loop', 'genesis_do_sidebar' );
  add_action( 'genesis_sidebar', 'genesis_do_sidebar_alt' );
 
}