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:
Adjusting the lumbar support
You can adjust the contour of the front seats
so as to provide optimum support for your
back.
Move adjustment lever 1 in the
direction
of the arrow until the desired backrest
contour is ...
Tire pressure of at least 180 kPa
(1.8 bar/26 psi) is not reached
If, after five minutes, a pressure of 180 kPa
(1.8 bar/26 psi) has not been achieved:
– Switch off the tire inflation compressor.
– Unscrew the filler hose from the valve of
the faulty tire.
– ...
Setting the interior/exterior lighting
delayed switch-off time
Interior lighting: you can set whether and for
how long you wish the interior lighting to
remain on in the dark after you have removed
the SmartKey from the ignition lock.
Exterior light: you c ...