Page 312 of 585
311 Controls in detail
Useful features
The Tele Aid system is available if
it has been activated and is operation-
al. Activation requires a subscription
for monitoring services, connection
and cellular air time
vehicle battery power is available
the relevant cellular phone network
and GPS signals are available and pass
the information on to the Response
CenterInitiating an emergency call manually
1Cover
2SOS button
Briefly press on cover1.
The cover opens.
Press SOS button2 briefly.
The indicator lamp in SOS button2
will flash until the emergency call is
concluded.
Wait for a voice connection to the
Response Center.
Close cover1 after the emergency
call is concluded.
i
Location of the vehicle on a map is only pos-
sible if the vehicle is able to receive signals from
the GPS satellite network and pass the informa-
tion on to the Response Center.
Warning!
G
If the indicator lamp in the SOS button is
flashing continuously and there was no
voice connection to the Response Center
established, then the Tele Aid system could
not initiate an emergency call (e.g. the rele-
vant cellular phone network is not available).
The message
Call failed
appears in the
multifunction display for approximately
10 seconds.
Should this occur, assistance must be sum-
moned by other means.
Page 447 of 585
446 Practical hintsWhat to do if …Symbol messagesDisplay symbol
Display messages
Possible cause/consequence
Possible solution
#
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
Do not forget that the brake system
requires electrical energy and may be
operating with restricted capability.
Considerably greater brake pedal
force is required and the stopping dis-
tance is increased.
Stop the vehicle in a safe location or as
soon as it is safe to do so.
Apply the parking brake (
page 65).
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise the
engine will overheat due to an inoperative
water pump which may result in damage
to the engine. Notify an authorized
Mercedes-Benz Light Truck Center.
If it is intact:
Drive immediately to the nearest
authorized Mercedes-Benz Light Truck
Center. Adjust driving to be consistent
with reduced braking responsiveness.
Page 448 of 585
447 Practical hints
What to do if …
Display symbol
Display message
Possible cause/consequence
Possible solution
#
Battery/Alternator
Stop vehicle
The battery is defective.
Stop the vehicle in a safe location or as
soon as it is safe to do so.
Apply the parking brake (
page 65).
Do not continue to drive.
Notify an authorized Mercedes-Benz
Light Truck Center.
y
inoperative
Downhill Speed Regulation is
malfunctioning.
Have the Downhill Speed Regulation
checked by an authorized Mercedes-Benz
Light Truck Center.
2
Brake wear
The brake pads have reached
their wear limit.
Have the brake pads replaced as soon as
possible.
!
Brake pad thickness must be visually in-
spected by a qualified technician at the intervals
specified in the Maintenance Booklet.
