The Borderlands 2 Season Pass includes four all-new add-on campaigns featuring new areas to explore, new adventures to undertake, new enemies to overcome and the Ultimate Vault Hunter Mode Upgrade Pack in a bundle that's available at a discounted rate over buying each add-on individually.
These add-ons will become available through the in-game "Downloadable Content" menu as they are released. To obtain this content, please follow the instructions below.
1) In the main menu of Borderlands 2, select "Downloadable Content."
2) Select and download "Season Pass" from the menu. If you have already purchased a Season Pass on the account you're logged in to, you will not be charged again.
3) Once the "Season Pass" has finished downloading, return to the main menu of Borderlands 2.
4) From the main menu of Borderlands 2, select "Downloadable Content."
5) Any available "Season Pass" content should now be listed as "Free" allowing you to download and install any applicable add-ons through the "Downloadable Content" menu at no additional charge.
For issues with the Borderlands 2 Season Pass on Xbox 360, please contact Xbox Support at: http://support.xbox.com/en-US/contact-us