1997 MERCEDES-BENZ ML350 CD changer

Title forward/backward
If the "joystick " is pressed to right the next CD title is skipped. Pressing to left within the first 10 s of
playback causes jumping to the previous title, otherwise to the beginning of the title presently being
played. If the" joystick " is held to left or right the changer jumps from one title to the next within short
time intervals without playing them.
Fast forward/rewind (music search)
If the "joystick " is pressed up or down the titles are played quickly. This allows specific parts of a title to
be played or skipped. When the start or end of the CD is reached the search is interrupted.
Title repetition and random playback
Random playback can be activated/deactivated with the multifunction " RDM " key. When activated this
function is indicated on the display and random playback can then be selected. The random playback
feature affects only the CD presently being played back. Title repetition can be activated/ deactivated
with the multifunction " RPT key. The title presently selected is repeated until the function is deactivated.
The random playback and title repetition remain active, even when the radio and navigation module
(A2/56) is switched off and switched back on again. Actuating these two functions simultaneously is not
possible.
Pause
The multifunction key" II "(Pause ) interrupts the title presently being played. Pressing again continues
playback.
Direct title selection
Pressing the " *" button followed by entry of the desired title via the number block allows direct selection
of the title.
Multifunction key Time
By pressing the multifunction key" Time " it is possible to change between 2 different display modes:
Display of title number and previous playback time of title (standard setting)
Number of titles and entire playback time of CD ("Time appears on display).
CD title assignment, function
Each CD has a permanently stored, so-called T able of C ontents (TOC ) entry. The radio and navigation
module (A2/56) recognizes the CD clearly on the basis of this entry and can automatically designate it (even
when the CD is then inserted into another CD ma
gazine) after the title has been assigned once by the user.

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
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Moreover, the TOC entry includes information about the number of titles on a CD and the entire playing time
of the CD .
VOLUME/TONE ADJUSTMENTS, FUNCTION - GF82.60-P-2003B
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
Basic features
The balance and fader settings apply for all signal sources (radio, CD, voice output).
The base and treble settings can be stored separately for the following signal sources:
Radio
Traffic announcements
Navigation voice output
Integrated CD player
Optional CD changer
Volume and tone settings for traffic announcements
The volume for traffic announcements can be changed during a traffic announcement (procedure analog to
adjusting navigation system voice output).
Volume and tone settings for navigation system voice output
The volume is automatically increased by a defined level during voice output. The volume level increase can be
set in stages directly at the radio (A2). The radio is preset to 6 dB.
During voice output, the volume can be changed with the left knob. The base/treble settings can be changed
with the right knob after pressing the "tone" button (during voice output). The settings can be continued after
conclusion of the voice output; the setting mode is terminated 8s after actuating the last button.
VOLUME/TONE ADJUSTMENTS, FUNCTION - GF82.60-P-2003GI
MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357)
Volume/tone adjustments,
function GF82.60-P-2003GI
Radio/navigation module,
location/purpose/
design/function GF82.61-P-4109GI
Switch on/off behavior,
function GF82.85-P-2006B

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 67 © 2006 Mitchell Repair Information Company, LLC.

Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE
(491) U.S. version
It is necessary to distinguish between audio and service sources on the radio and navigation module (A2/56) :
Audio sources are:
Radio
CD player
CC player
CD changer (code 819a)
Service sources include:
Voice output on navigation
telephone
Signal editing required for volume and tone settings is accomplished by the audio component integrated into
the radio and navigation module (A2/56)
If the vehicle is additionally equipped with a sound system (code 810), the sound amplifier (A2/13) ensures
final audio signal amplification.
Volume setting
By turning the volume knob the volume of the corresponding mode changes.
Tone setting
The tone settings as well as the general brightness adjustment of the display can be reached by pressing
the multifunction key" ADJ ". If the multifunction key" ADJ " is pressed for longer than 2 s all tone
settings of all modes jump back to the center position. This is confirmed by a short peep tone. The
adjustment possibilities for treble/bass, balance and fader are summarized in one display.
They can be selected by actuating the multifunction keys " " and " ". The corresponding setting can be
changed by actuating the multifunction keys"- " and "+ " or "L ", "R ", "F " and "R ".
These settings can also be made with the "joystick " in an analogous manner. When the headlamps are
switched on the brightness setting of the display can be reached by pressing the multifunction key" BRT" in the
tone setting menu. Here it is possible to select between " bright " and "dark ". Simultaneously pressing the
multifunction keys " - " and "+ " or "L " and "R " or "F " and "R " resets the corresponding setting in the
current mode to the center position
Tone setting is not possible in the telephone or navigation mode. The tone or brightness setting can be exited
by pressing the multifunction key EXIT ".
Voice output, function GF82.85-P-3001GI

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
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AUDIO 30 APS, FUNCTION - GF82.61-P-0002A
MODEL 163,168,170, 208, 210 with CODE (353) Audio 30 APS
Fig. 42: Identifying Radio And Navigation Unit

The Audio 30 APS has the following functions:
Radio
Performance corresponds to an MB radio in the superior class (3/99)
Navigation system
Performance and function are comparable with the current auto-pilot system (APS) (status 3/99)
Combined CD player for audio and navigation
Audio signal processing and amplification with control of optional units, e.g.:
Amplifier for sound system (N40/3) and CD changer (A2/6)
Digital data bus (D2B) and CAN data bus interface
The system is distinguished by its high degree of integration resulting in optimum compactness. The following
components are integrated into the radio and navigation unit (A2/56) :
CD-ROM drive for navigation and playing audio CD's
Navigation processor including global positioning system (GPS) receiver and gyrosensor
Radio with two-tuner technology
not used presently. (Status: 3/99)

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 73 © 2006 Mitchell Repair Information Company, LLC.

4-channel power amplifier for vehicle loudspeakers
System interlinkage
The radio and navigation unit (A2/56) is provided with the following components for data exchange with
external digital components:
CAN (A1 -A2/56)
The radio and navigation unit (A2/56) is connected with the instrument cluster (A1) via a separate
CAN bus. The difference to the other CAN systems is indicated by the spelling CAN bus (A1-A2/56).
The CAN bus (A1-A2/56) allows the following functions:
Operation of the radio and navigation unit (A2/56)is also possible with the multifunction steering
wheel.
The multifunction display (A1/p13) in the instrument cluster (A1) can display navigation
information on the current operating status of the radio and navigation unit (A2/56) .
The connection to the CAN bus (A1-A2/56) is only realized on models 208 and 210. (Status 3/99)
Digital data bus (D2B)
Data can be exchanged between the external audio components, the telephone system and - if present -
the voice control system over the D2B bus. This allows control data as well as the actual audio signals
(e.g. music from CD changer) to be transferred.
The only additional D2B component presently possible is the CD changer (A2/6) (Status: 3/99)
K bus (diagnostic interface)
Data exchange is accomplished between the diagnostic interface and the hand-held tester (reading out
DTCs and actual values, ...).
The communication between the HHT and all other D2B components is accomplished over the radio
and navigation unit (A2/56) diagnostic interface.
Audio 30 APS, location of
componentsModel 163GF82.61-P-0002-01D
Model 168GF82.61-P-0002-01B
Model 170GF82.61-P-0002-01A
Model 208, model 210&.2.(GF82.61-P-0002-
01C)
Audio 30 APS block
diagramModel 163GF82.61-P-0002-02D
Model 168GF82.61-P-0002-02B

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 74 © 2006 Mitchell Repair Information Company, LLC.

RADIO AND NAVIGATION MODULE, DESIGN - GF82.61-P-4109-03GI
The following is integrated into the radio and navigation module (A2/56) (maximum scope):
Graphic compatible 5" LCD color display
Navigation processor with GPS receiver and gyrosensor
Single CD drive for playing audio CD's (option)
Navigation CD drive for loading navigation data or for playing audio CD's (optional)
Telephone unit (optional)
Radio tuner
Audio amplifier
CC player
The radio and navigation module (A2/56) has the following digital interfaces:
Digital data bus (D2B)
K-cable (diagnosis interface)
Fig. 58: Identifying Radio And Navigation Module (A2/56) Design

RADIO AND NAVIGATION MODULE, FUNCTION - GF82.61-P-4109-04A
Models 163, 168, 170, 208, 209, 210 with code 353
Processing key signals
The controls on the radio (A2) are read in via I/O ports of the microcontroller and made available to the central
computer. Depending on the system function the button operations are processed further in the central computer
or conveyed via the Digital Data Bus (D2B) or interior CAN (CAN B) in the form of a data telegram to the
system components involved (e.g. CD changer).
Display

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Map data.
The digitized map area on the CD-ROM contains towns, cities, streets, intersections and their attributes (e.g.:
one-way streets, turn prohibitions, ...). It does not contain information about company and private ground,
farms, housing estates and agricultural roads.
Gyrosensor
The gyrosensor determines the direction change of the vehicle. It is installed in the navigation processor .
Calibration is not required.
RADIO AND NAVIGATION UNIT, LOCATION/PURPOSE/DESIGN/FUNCTION - GF82.61-P-4109A
MODEL 163,168,170, 208, 210 with CODE (353) Audio 30 APS
Fig. 59: Identifying Radio And Navigation Unit

Radio and navigation
unit, location GF82.61-P-4109-01A
Radio and navigation
unit, purposeRadio reception and
operation
Input/output and control
unit for navigation
Amplification of audio
signals
Control of integrated CD
player and (optional) CD
changer (A2/6)

Radio and navigation
unit, design GF82.61-P-4109-03A
Radio and navigation
unit, function GF82.61-P-4109-04A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
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SURVEY OF SYSTEM COMPONENTS, AUDIO 30 APS, LOCATION/TASK/ DESIGN/FUNCTION - GF82.61-P-9998ZZ
MODELS 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
CD changer
(optional)
Sound system
(optional)
Navigation system
(optional)
Telephone (optional)
Radio and navigation
module, design GF82.61-P-4109-03GI
Radio and navigation
module, function GF82.61-P-4109-04GI
Radio and navigation unit,
location/task/design/ functionModel 163, 168,
170,208,210GF82.61-P-4109A
Model 209GF82.61-P-4109QA
Radio location/task/design/functionModel 203GF82.60-P-4109P
Additional fan for radio/navigation
unit, location/ taskModel 203 as of
1.6.03GF82.61-P-4110P
FM/AM antenna amplifier,
location/task/design/ functionModels 163, 168,
170, 208.4, 210.2GF82.62-P-4101A
Models 208.3, 210
(except, 210.2) with
code 352a
Antenna amplifier module,
location/task/design/ functionModels 203.0/7,
209.3GF82.62-P-3105PP
Model 203.2GF82.62-P-3105PS
Model 209.4GF82.62-P-3105QA
Rear window antenna,
location/task/design/ functionModels 203.0/7,
209.3GF82.62-P-3106PP
Model 203.2GF82.62-P-3106PS
Windshield antenna,
location/task/design/ functionModel 209.4GF82.62-P-3112Q
Radio reception antenna, location/taskModel 209.4GF82.62-P-4103Q
Radio reception amplifier, location/taskModel 209.4GF82.62-P-4104Q
Telephone antenna, location/taskModels 203.0/2/7,
209.3GF82.62-P-4105PP
Model 209.4GF82.62-P-4105Q
GPS/telephone roof antenna,
location/task/ design/functionModels 163, 168,
208.3, 210GF82.70-P-4111A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 106 © 2006 Mitchell Repair Information Company, LLC.