Here's how to access the self diagnostic / configuration menu on a Nissan Almera 2003 SVE (N16):
- Start the engine
- Turn the radio on
- Turn the radio off
- Hold the info button in then:
- Turn the volume knob up (clockwise) until:
- Diagnostic menu appears
From here you can do various things: run self-diagnostics; reset/change the main service counter; various other tests for the climate control, sat nav system, etc.