Diagnostics mode (iPod)

Diagnostics mode is a feature of the Pixo-based operating system on non-iOS iPods. It allows the user to test the device’s hardware.

Diagnostics on other Apple devices
Diags was used as a similar tool for iOS devices by factory staff working on behalf of Apple Inc. Apple Support staff generally use iOS Diagnostics with a more basic user interface that simply generates a reference code. Macs that have macOS Big Sur (version 11) or later pre-installed include an Apple Diagnostics utility that end users can access.