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
self-diagnosis.
• 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 self-test.
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: Mercedes-Benz Customer Assistance
Center under
1-800-FOR-MERCedes(1-800-367-6372)
or 1-888-990-9007
• Canada: Customer Service at
1-888-923-8367
See also:
Fuse box on the left in the direction of
travel
Open the hood.
Remove any existing moisture from the
fuse box using a dry cloth.
AMG vehicles: remove the control unit
above the fuse box.
To open: undo screws 1 with an Allen
key.
...
Snow chains
For safety reasons, Mercedes-Benz
recommends that you only use snow chains
which have been specially approved for your
vehicle by Mercedes-Benz, or are of a
corresponding standard of quality.
...
Problems with PARKTRONIC
Problem
Possible causes/consequences and
Solutions
Only the red segments in the PARKTRONIC warning displays
are lit.
You also hear a warning tone for approximately two s ...