System self-test
After you have switched on the ignition, the system carries out a self-diagnosis.
WARNING
A malfunction in the system has been
detected if one of the following conditions
occurs:
• the indicator lamp in the SOS button does
not light up during the system selfdiagnosis.
• the indicator lamp in the 
Roadside
Assistance button does not light up during
the system self-diagnosis.
• The indicator lamp in the 
information
button does not light up during selfdiagnosis
of the system.
• the indicator lamp in the SOS button,
Roadside Assistance button or
information button continues to be lit red
after the system self-diagnosis.
• The Tele Aid Inoperative or Tele Aid
Not Activated message appears in the
multifunction display after the system selftest.
If a malfunction is indicated as outlined above,
the system may not operate as expected. In
the event of an emergency, assistance must
be summoned by other means.
Have the system checked at the nearest
authorized Mercedes-Benz Center or contact
the following service hotlines:
• USA: Response Center under
888-990-9007
• Canada: Customer Service at
1-888-923-8367
See also:
Vehicle data, GL 450
The data stated here refers specifically to a
vehicle with standard equipment. Consult an
authorized Mercedes-Benz Center for the
data for all vehicle variants and trim levels.
...
Deleting contacts
To delete a group of contacts: select
Data/Connections in the telephone basic
menu by sliding and turning
the
COMAND controller and press to
confirm.
Select Delete Contacts and press ...
Setting the side air vents
To open/close: turn thumbwheel 3 up or down.
Side window defroster vent 1 is never completely shut, even if side air vent
2 is shut. ...