Updating your Toyota Highlander navigation system depends on several factors, including model year. However, you can update the navigation using a computer with a windows operating system, a Mac operating system, or install a DVD. To update using a computer with a windows operating system, download the Map update toolbox. Once you are done, open the toolbox and insert the SD card from your vehicle inside the computer. Create a backup for the content on your SD card, and then log in to the map update toolbox. A button labeled Updates or Device will display. Select it and then click on install. Once the update is complete, create a new backup of the content on your SD card, remove it and insert it back into your vehicle.