Page 175 of 356

173 Controls in detail
Useful features
Electrical outletElectrical outletOne outlet is located in the front passen-
ger footwell and another on the right-hand 
side of the luggage compartment.
Flip up cover and insert electrical plug 
(cigarette lighter type).
Telephone*
Radio transmitters, such as a portable tele-
phone or a citizens band unit, should only 
be used inside the vehicle if they are con-
nected to an antenna that is installed on 
the outside of the vehicle.
The external antenna must be approved by 
Mercedes-Benz. Please contact an autho-
rized Mercedes-Benz Light Truck Center 
for information on the installation of an ap-
proved external antenna. Refer to the radio 
transmitter operation instructions regard-
ing use of an external antenna.
iThe outlets function even if the key is 
not in the ignition.
The electrical outlet can be used to 
accommodate electrical consumers 
(e.g. air pump, auxiliary lamps) up to a 
maximum of 180 W.
If the engine is off, the battery may be-
come discharged if used for long peri-
ods of time.
Warning!
G
Never operate radio transmitters equipped 
with a built-in or attached antenna (i.e. with-
out being connected to an external antenna) 
from inside the vehicle while the engine is 
running. Doing so could lead to a malfunc-
tion of the vehicle’s electronic system, pos-
sibly resulting in an accident and / or serious 
personal injury. 
     
        
        Page 184 of 356

182 Controls in detailUseful features
Remote door unlock
In case you have locked your vehicle unin-
tentionally (e.g. key inside vehicle), and no 
other key is available:
Contact the Mercedes-Benz Response 
Center at 1-800-756-9018 (in the USA) 
or 1-888-923-8367 (in Canada).
You will be asked to provide your pass-
word which you provided when you 
completed the subscriber agreement.
Then return to your vehicle and pull 
outside handle of the liftgate for mini-
mum of 20 seconds until the SOS but-
ton is flashing.
The message 
EMERGENCY CALL – 
CALL CONNECTED appears in the MCS 
display.
As an alternative, you may unlock the vehi-
cle via Internet using the ID and password 
sent to you shortly after the completion of 
your acquaintance call.
!If the indicator lamp continues to flash 
or the system does not reset, contact 
the Response Center at 
1-800-756-9018 (in the USA) or 
1-888-923-8367 (in Canada), or 
Mercedes-Benz Customer Assistance 
at 1-800-FOR-MERCedes 
(1-800-367-6372) in the USA or Cus-
tomer Service at 1-800-387-0100 in 
Canada.iThe indicator lamp on the correspond-
ing button flashes until the call is con-
cluded. Calls can only be terminated by 
a Response Center or Customer Assis-
tance Center representative, except 
Roadside Assistance and Information 
calls, which can also be terminated by 
using the END button on the MCS unit.
iWhen a Tele Aid call has been initiated, 
the MCS system audio is muted and 
the selected mode (radio, tape or CD) 
pauses. The optional cellular phone (if 
installed) switches off. If you must use 
this phone, the vehicle must be parked. 
Disconnect the coiled cord and place 
the call. The navigation system (if en-
gaged) will continue to run. A pop-up 
window will appear in the MCS display 
to indicate that a Tele Aid call is in 
progress. 
     
        
        Page 189 of 356

187 Controls in detail
Useful features
Step 9:
Press “training” button on the garage 
door opener motor head unit.
The “training light” is activated.
You have 30 seconds to initiate the 
following step.
Step 10:
Firmly press, hold for two seconds and 
release the programmed integrated 
signal transmitter button (3, 4 
or5).
Step 11:
Press, hold for two seconds and 
release same button a second time to 
complete the training process.
Some garage door openers (or other rolling 
code equipped devices) may require you to 
perform this procedure a third time to 
complete the training.Step 12:
Confirm the garage door operation by 
pressing the programmed integrated 
signal transmitter button (3, 4 
or5).
Step 13:
To program the remaining two buttons, 
repeat the steps above starting with 
step 3.Gate operator / Canadian programming
Canadian radio-frequency laws require 
transmitter signals to “time-out” (or quit) 
after several seconds of transmission 
which may not be long enough for the inte-
grated signal transmitter to pick up the sig-
nal during programming. Similar to this 
Canadian law, some U.S. gate operators 
are designed to “time-out” in the same 
manner.
If you live in Canada or if you are having dif-
ficulties programming a gate operator (re-
gardless of where you live) by using the 
programming procedures, replace step 4 
with the following: