Page 140 of 417

139 Controls in detail
Control system
You can use the functions in the 
TEL
 menu 
to operate your telephone, provided it is 
connected to a hands-free system and 
switched on.
Switch on the telephone and the radio.
Press button ÿ or è on the 
steering wheel repeatedly until you see 
the 
TEL
 menu in the left display.
Which messages will appear in the right 
display field depends on whether your tele-
phone is switched on or off:
If the telephone is off, the message in 
the multifunction display is: 
TEL OFF
.
If the telephone is on:
The telephone will then search for a 
network. During this time the right dis-
play is empty.
As soon as the telephone has found a 
network, 
READY
 is indicated in the right 
display.
1Signal strength
This standby message indicates that your 
telephone is ready for use and you can op-
erate it using the control system.You may carry out the following functions:
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 
personal injury.
Function
Page
Rejecting a call
140
Answering a call
140
Ending a call
140
Dialling a number from the 
phone book
141
Redialing
142 
     
        
        Page 204 of 417

203 Controls in detail
Useful features
12-V socket
The 12-V socket is located on the left side 
in the trunk.
112-V socket
Switch on the ignition (
page 40).
Flip up cover and insert electrical plug 
(cigar lighter type).
Telephone
The telephone is located in the center stor-
age compartment (
page 201).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 Center for informa-
tion on the installation of an approved 
external antenna. Refer to the radio trans-
mitter operation instructions regarding use 
of an external antenna.
iThe 12-V socket can be used to 
accommodate electrical consumers 
(e.g. air pump, auxiliary lamps) up to a 
maximum of 180 W or as a battery 
charging point (
page 355).
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 personal 
injury. 
     
        
        Page 238 of 417

237 Operation
Driving instructions
Control and operation of radio transmitters
Radio and telephoneTelephones and two-way radios
Radio transmitters, such as a portable 
telephone or a citizens band unit should 
only be used inside the vehicle if they are 
connected to an antenna that is installed 
on the outside of the vehicle.
Refer to the radio transmitter operation 
instructions regarding use of an external 
antenna.
Catalytic converter
Your Mercedes-Benz is equipped with 
monolithic-type catalytic converters, an 
important element in conjunction with the 
oxygen sensors to achieve substantial 
control of the pollutants in the exhaust 
emissions. Keep your vehicle in proper 
operating condition by following our 
recommended maintenance instructions 
as outlined in your Maintenance Booklet.
Warning!
G
Please do not forget that your primary 
responsibility is to drive the vehicle safely. 
Only operate the radio or telephone
1 if road, 
weather and traffic conditions permit.
Bear in mind that at a speed of just 30 mph 
(approximately 50 km/h), your vehicle is 
covering a distance of 44 feet 
(approximately 14 m) every second.
1Observe all legal requirements.
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, 
possibly resulting in an accident and 
personal injury.
!To prevent damage to the catalytic 
converters, only use premium unleaded 
gasoline in this vehicle.
Any noticeable irregularities in engine 
operation should be repaired promptly. 
Otherwise excessive unburned fuel 
may reach the catalytic converter, 
causing it to overheat and potentially 
start a fire.