: With the car off, insert the card into the "MAP" slot of the head unit and turn on the ignition. The system should automatically detect the files and begin the loading process. Common Challenges ERC Unlock Codes

The system is essentially a dedicated computer that requires a boot medium to launch its operating system (OS) and navigation software. The internal memory of the unit is limited; the bulk of the map data, the user interface graphics, the bootloader files, and the voice guidance software are all stored on the external Secure Digital (SD) card.