The available settings include,
1) Radio frequency settings for various countries.
2) Clock 12Hr or 24Hr Mode.
3) Turn on volume for the sat nav audio input.
4) Left Hand or Right Hand Drive.
5) 2 or 4/5 Speaker output (Ute or Sedan/Wagon).
6) Antenna type (Single or Calais Dual Diversity, On Glass Antenna).
To enter the audio service mode,
1) Turn the ignition to the Accessories Position.
2) Turn the audio system off by pressing the volume button.
3) Press and hold the Right Disc Change Button.
4) Whilst holding the above button, press and hold the Right Track Change Button.
5) Whilst holding the above buttons, press and hold the audio system on button.
6) Keep the above buttons depressed for 12 seconds.
7) The Audio Service Menu will appear.
This setting allows you to enable the Diversity Antenna (On glass antenna) for calais models. Please note : Only Calais, statesman and caprice models have the rear on glass antenna option, and as such, this mode should only be enabled for these models.