Mercedes-Benz ML320. Manual — part 250

When the rotary knob is actuated in the switched-on state the radio and navigation module (A2/56) can be
switched off.

Switch-off characteristics when voltage is too low

The central processor in the radio and navigation module (A2/56) permanently monitors the battery voltage.
Depending on the voltage value the system will act as follows:



The battery voltage less than 9.5 volts

If the battery voltage drops below 9.5 volts the radio and navigation module (A2/56) switches off
automatically.

If the system switches off and the voltage increases to greater than 9.5 volt the radio and navigation module
(A2/56) does not switch back on automatically.

If the system switches off it can be switched back on manually .

TELEPHONE MODE, FUNCTION - GF82.85-P-2007GI

MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357)
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE
(491) U.S. version

Radio mode, function

GF82.60-P-2001GI

CD-player mode,
function

GF82.60-P-2002GI

Telephone mode,
function

GF82.85-P-2007GI

Cassette mode, function

GF82.85-P-2010GI

Navigation mode,
function

GF82.85-P-2012GI

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

Fig. 84: MCS Telephone System Block Diagram

The telephone system can be operated as follows:



directly on the radio and navigation module (A2/56) or



with the portable cellular telephone (A34/6) or



with the telephone handset (A34)

Making a call, function

The data telegrams (e.g. button actuation) for controlling the telephone system are relayed to the telephone
transmitter/receiver (A35) from the radio and navigation module (A2/56) via the digital data bus ( D2B )

The actual telephone connection is completed by the CTEL/GPS antenna splitter (A2/57) and the CTEL and
GPS roof antenna (A2/49)

The audio source is automatically muted during a telephone call.

After switching over to the telephone mode the following display appears:



Strength of received signal (illustrated with 5 beams )



Message indicating readiness for telephone mode with "Ready " display.

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me



Multifunction keys "NUM " and "NAME ".



Entering code

The telephone can be protected against undesired use by entering a three - digit code. All telephone
functions are disabled except the emergency call function.

The telephone can be enabled again by entering the three - digit code (correction possible with " Clear " button
in the event of incorrect entry) and actuation of the multifunction key" OK ".

The following functions are available in the telephone mode:



Emergency call function

This function offers the possibility of transmitting an emergency call within the reception range of the
radio telephone network. The emergency call number is stored in the memory location 1 and can be
called even when the telephone is disabled. The emergency call is performed by pressing and holding
control button 1 down longer than 1 second " EMERGENCY " appears on the display. An emergency
call can be terminated by pressing " the "END " button.



Manual entry of telephone number

Telephone numbers can be entered manually on the number pad.

An incorrectly entered number can be deleted by momentarily pressing the " CLEAR " button. If the" CLEAR
" button is pressed for longer than 2 s all telephone numbers deleted

If the number entered consists of only 1 or 2 numbers, the telephone number stored in the memory with this

code is dialed.

The entered telephone number can be transmitted to the telephone by pressing the " SEND " button. The
telephone compares the transmitted telephone number with the telephone number stored in the memory. If the
numbers coincide the associated name, the memory location number and the telephone appear on the display
(depending on setting).

If the numbers do not coincide, the telephone number entered is still displayed.

Then the connection can be completed. The duration of the telephone call is indicated in minutes and seconds.
The call can be terminated by pressing the " END " button.



Selecting stored telephone number

The memory can be called up by pressing the multifunction key" NAME " or "NUM "."NAME "
indicates the stored names on the display" NUM " indicates the memory location number as well as the
associated telephone number. By pressing the" joystick " up or down the stored entries are displayed.
Pressing to the right or left causes display of the next 4 entries or previous 4 entries.

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me

If a name is not available for the stored telephone number, the display is switched over and the

memory location and the telephone number are displayed.

By manually entering 1 or 2 numbers and subsequent actuation of the multifunction key" NAME " or
"NUM " the name stored under this memory location number or the stored telephone number are
indicated.

Pressing " SEND " button completes the desired connection. If no connection is to be completed, the
memory area can be exited by pressing the multifunction key" EXIT ".



Quick dial

When a one or two-digit number is entered and the " SEND " button is actuated the telephone number
stored under this memory location number is dialed.



By pressing and holding one of the number buttons 1 to 9 for more than 2 s the telephone number stored
under this memory location number is dialed. In this case it is not necessary to actuate the " SEND "
button.

Memory location functions 1 number is reserved for emergency !



Redialing

Pressing the" SEND " button without previously entering a telephone number calls up the last 5 selected
telephone numbers on the display. It is possible to select the desired telephone number by pressing the"
joystick " up or down. The connection is completed by actuating the" SEND " button. This area can be
exited by pressing the multifunction key" EXIT ".



Incoming calls

During an incoming call all other audio sources are set to mute and "CALL " appears on the display. The
call can be accepted by pressing the " SEND " button or terminated by pressing the" END " button.
During a call it is possible to continue dialing, e.g. enter a code number for an answering machine.

CASSETTE MODE, FUNCTION - GF82.85-P-2010GI

MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357)
Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE
(491) U.S. version

GPS roof
antenna/telephone,
location/purpose/
design/function

GF82.70-P-
4111A

2001 Mercedes-Benz ML320

1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis

me