1997 MERCEDES-BENZ ML320 audio

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
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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
Saturday, October 02, 2010 3:30:06 PMPage 139 © 2006 Mitchell Repair Information Company, LLC.

By pressing the multifunction key" Side" the side of the CCcan be changed. This is indicated on the
display by" Side 1 " or" Side 2 ". The side changes automatically when the end of the tape is reached.
Fast forward/rewind
Pressing the "joystick " to the left right causes the CC to be wound backward and forward at high speed.
The procedure can be stopped by pressing the" joystick" again in any direction. When the end of the tape
is reached the side is changed automatically and playback continues.
Music search
The music search feature can be started by pressing the " joystick " upward for forward or downward for
rewind. During the search "MS FWD " or "MSREW " appears on the display. As soon as sufficiently
large pause ( approx. 3 s ) is recognized, the search stops and playback starts automatically. The search
can be stopped manually by pressing the" joystick " in any direction.
Scan function
The multifunction key" Scan " causes all titles on the CC to be played for approx. 8 s . . Pressing the
multifunction key" Scan " again stops this procedure.
Dolby B
Actuating multifunction key" Dolby " activates this function. The Dolby system appears inverted on the
display. Pressing again deactivates this function.
Pause "II"
The following events cause the function to change from "Play " to "Pause ":
Pressing multifunction key "Pause " (display changes from "II " to "Play ").
By an incoming or outgoing call
Switching over to another audio mode.
Pause recognition
Pressing the multifunction key" Skip " activates or deactivates the pause recognition function. If a pause
of more than 15 s . is recognized the drive changes automatically to fast forward. If this function is
activated the display appears inverted.
NAVIGATION MODE, FUNCTION - GF82.85-P-2012B
MODEL 163, 168, 170, 208, 210 with CODE (353) Audio 30 APS
Volume/tone
adjustments, function GF82.60-P-2003GI

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:06 PMPage 141 © 2006 Mitchell Repair Information Company, LLC.

Audio 30 APS block diagram in navigation mode
Fig. 87: Audio 30 APS In Navigation Mode Block Diagram

The location of the vehicle as well as the direction and distance to the destination (according to destination
entered) is determined with the aid of the navigation system. Then the required measures to reach the
destination are started (guidance) .
The navigation system can be activated by pressing the "NAV" button on the radio and navigation unit
(A2/56) .
A navigation processor with CD-ROM drive is integrated into the radio and navigation unit (A2/56) for
reading in the navigation data (digital map, speech segments and software).
The navigation CD-ROM drive can also be used to play audio CDs.
Entering destination
The destination can be entered with menu guidance on the radio and navigation unit (A2/56) and processed by
the navigation processor . The system only allows entry of destination addresses stored on the CD-ROM.
The following possibilities are available for entering a destination:
Call-up of destination stored in destination memory
Free entry of destination with menu guidance based on name (when destination is stored on CD-ROM)
Location finding

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:06 PMPage 142 © 2006 Mitchell Repair Information Company, LLC.

The navigation processor continuously calculates the location of the vehicle with the aid of the following
procedures:
GPS location finding
Basic location finding (dead reckoning)
Map-supported location finding (map matching)
The correct position is determined by continuously comparing the locating result of these three procedures.
Route calculation
The route is calculated in the navigation processor according to the destination entered, or automatically, after
deviating from the recommended route. The recommended route is stored in the navigation processor
Guidance
After the navigation processor has calculated the route, guidance is started. The driver receives continuous
information with the aid of guidance symbols appearing on the display of the radio and navigation unit
(A2/56) and voice announcements on the vehicle loudspeaker.
Audio 30 APS block diagramModel 163GF82.61-P-0002-02D
Model 168GF82.61-P-0002-02B
Model 170GF82.61-P-0002-02A
Models 208, 210GF82.61-P-0002-02C
Basic location finding (dead
reckoning), function GF82.61-P-3006D
Global positioning system (GPS)
location finding, function GF82.61-P-3007C
Map-assisted location finding,
function GF82.61-P-3008C
Route calculation, function GF82.61-P-3011E
Destination guidance, function GF82.61-P-3012D
Loading language, function GF82.61-P-3003B
Volume and tone settings GF82.60-P-2003A
Radio mode, function GF82.60-P-2001B
CD player mode, function GF82.60-P-2002B
Radio and navigation unit,
location/purpose/ design/function GF82.61-P-4109A
CTEL and GPS roof antenna,
location/purpose/ design/functionModels 163,
168,208.3,210GF82.70-P-4111A
Global positioning system antenna,
location/ purpose/design/functionModels 170, 208.4GF82.61-P-4106A
Antenna splitter, Model 163GF82.85-P-3107B

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 143 © 2006 Mitchell Repair Information Company, LLC.

NAVIGATION MODE, FUNCTION - GF82.85-P-2012GH
MODEL 163
Fig. 88: COMAND Navigation System Block Diagram

Function
The navigation system is integrated into the COMAND operating, display and control module (A40/3) . The
location of the vehicle and the direction to and distance from the destination (according to specified
destination) are determined with the aid of this system. Afterwards the required measures for reaching the
destination are initiated (destination finding) .
The navigation system is activated by pressing the " NAVI " button on the operating unit.
A navigation processor with CD drive for the digital map data is integrated in the COMAND operating,
display and control module (A40/3) .
The navi
gation CD drive can also play audio CDs.
location/purpose/design/ function

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:06 PMPage 144 © 2006 Mitchell Repair Information Company, LLC.

The navigation system can be activated by pressing the" NAVI" button on the control module.
A navigation processor with CD drive for the digital map data is integrated (optional) into the radio and
navigation module (A2/56)
The navigation CD drive can also play audio CD's .
Destination entry
The destination can be entered with menu-guidance on the control module and is processed by the navigation
processor . It is only possible to enter destinations which are stored on the CD-ROM .
Location finding
the radio and navigation module (A2/56) continuously calculates the vehicle location with the aid of the
following procedures:
GPS location finding
Basic location finding (dead reckoning)
Map-supported location finding (map matching)
The navigation processor calculates the most probable position by permanently comparing the location results
of these three methods.
Route calculation
The route calculation is accomplished in the navigation processor after the destination is entered or
automatically following a deviation from the suggested route.
The calculated route is stored in the navigation processor .
Route guidance
After the navigation processor has calculated the route guidance starts.
Route guidance is accomplished graphically with a digital map with direction arrows as well as with the aid of
the voice output on the vehicle loudspeakers. When the " NAVI VOICE " button is pressed the last current
navigation command is repeated. The volume of the voice output can be set on the volume knob during a
navigation command. The following functions are available in the navigation mode:
When the" NAVI MENU " button is actuated the main navigation menu opens.
All other entries can be made with the " joystick ".
"Dest" (destination entry)radio and navigation module (A2/56) offers the following possibilities for
destination entr
y:

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:06 PMPage 148 © 2006 Mitchell Repair Information Company, LLC.

Fig. 90: MCS Voice Output Block Diagram
The navigation system guidance feature is supported significantly by voice output .
The voice data was originally stored as single-word segments on the navigation CD-ROM . This data set is
transmitted automatically by the CD-ROM to the navigation processor and stored there.
The navigation processor interlinks these word segments to complete instructions or information and generates
corresponding AF signals. The generated AF signals are transmitted internally in the radio and navigation
module (A2/56) to the audio signal processing if required, amplified there and output via the vehicle
loudspeakers.
With the sound system (code 810) the voice signals are transmitted to the sound amplifier (A2/13) from the
audio signal processing via the digital data bus ( D2B ), amplified there, and then output via the vehicle
loudspeakers.
Several short, sequential drive recommendations are compiled to one single voice output.
Loading voice from CD-ROM
Only English is presently available for voice output on the radio and navigation module (A2/56) .
Volume of voice output
The voice output volume can be adjusted during voice output . This ensures that a defined interval is
maintained between the volume of the current audio source and voice output.
Example:
If the volume is reduced during voice output and the preceding volume interval to the audio signal is not
reached the radio and navigation module (A2/56)

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:06 PMPage 152 © 2006 Mitchell Repair Information Company, LLC.