1997 MERCEDES-BENZ ML500 sat nav

CD-PLAYER MODE, FUNCTION - GF82.60-P-2002GI
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
Fig. 38: Identifying CD
-Player Mode Function
CD changer 6-disc
Sound amplifier,
location/task/design/functionModels 209.3/4 with
code (810) sound
system
Models 203.0/2/7 up
to 23.4.04 with code
(810) Sound systemGF82.62-P-3100Q
Models 203.0/2/7 as
from 24.4.04 with
code (810) sound
system, except code
(498) Japan version,
except code (494a)
USA versionGF82.62-P-3100PM
Additional fan for radio/navigation unit
location/ taskModels 203.0/2/7 as
of 1.6.03GF82.61-P-4110P

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 64 © 2006 Mitchell Repair Information Company, LLC.

The radio and navigation module (A2/56)has various optional possibilities for the CD player mode.
CD mode with single CD drive (optional)
The radio and navigation module (A2/56) has an integrated CD drive as an option (code 818) intended for
playing audio CD's . If the radio and navigation module (A2/56) is equipped with a CD drive for navigation
(Code 357) as an option, it is also possible to play audio CD's . (However, during the navigation mode it is not
possible to play audio CD's Opening the operating and display module "(Open " button) allows access to the
CC slot and CD slot.
CD changer mode (with code 819)
The CD player with changer (A2/6) is actuated by the radio and navigation module (A2/56) .
The control signals and audio data from the CD player with changer (in trunk) (A2/6) are transmitted via the
digital data bus (D2B ). The changer is actuated by pressing the "CD" button twice . (When single CD drive is
installed).
Insert only 12 cm CD's into the CD player with changer (in trunk) (A2/6) , also do not use 8 cm CD
adapter .
On sound system (code 810) the sound amplifier (A2/13) takes over final amplification of the audio signals.
The signals between the radio and navigation module (A2/56) and sound amplifier (A2/13) are transmitted
via the digital data bus (D2B ).
The amplified signals are output by the vehicle loudspeaker system.
If the vehicle is equipped with sound amplifier (A2/13) the radio and navigation module (A2/56) should
be coded correspondingly with STAR diagnosis, otherwise malfunctions can occur when reproducing audio
signals.
When a magazine is inserted in the CD changer it is checked and a table of contents is made up. When the test
is completed the system automatically switches over to the playback mode and starts with the first title or next
possible compact disc.
If the system switches over to the CD mode before the test is completed the system starts playback of the CD
which was presently being checked.
The radio and navigation module (A2/56) offers the following functions in combination with the CD player
with changer (in trunk) (A2/6) and/or single CD drive :
Scan function
When the multifunction " Scan " key is pressed each title on the current CD is played for approx. 8 s .
The function is terminated b
y pressing the multifunction " Scan" key again.

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 65 © 2006 Mitchell Repair Information Company, LLC.

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
Saturday, October 02, 2010 3:30:05 PMPage 66 © 2006 Mitchell Repair Information Company, LLC.

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
Saturday, October 02, 2010 3:30:05 PMPage 68 © 2006 Mitchell Repair Information Company, LLC.

AUDIO 30 APS, LOCATION OF COMPONENTS - GF82.61-P-0002-01D
Fig. 39: Identifying Audio 30 APS Components Location
The FM/AM antennas are located in the rear window .
AUDIO 30 APS BLOCK DIAGRAM - GF82.61-P-0002-02D
Model 163 with code 353
Radio and navigation
module, location/purpose/
design/function GF82.61-P-4109GI

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 69 © 2006 Mitchell Repair Information Company, LLC.

Fig. 40: Identifying Audio 30 APS Block Diagram
AUDIO 30 APS OPERATING INST RUCTIONS - GF82.61-P-0002-03A
Models 163, 168, 170, 208, 210 with code 353
Controls on radio and navigation unit (A2/56) with explanations of primary functions.
Fig. 41: Identifying Radio A nd Navigation Unit Controls

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electr ical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 70 © 2006 Mitchell Repair Information Company, LLC.

Activating anti-theft alarm
During initial operation of the radio and navigation unit (A2/56) it is necessary to activate the anti-theft
alarm with the aid of the hand-held tester.
After activation has been accomplished, deactivation is no longer possible.
Only after activation is it necessary to enter a 5-digit code after interruption of the power supply. When entering
the code observe:
After the code has been entered incorrectly three times the message "Wait" appears. The radio and
navigation unit (A2/56) is then disabled for ten minutes. ?
Following the next three incorrect entries operation is not possible for ten minutes again. ?
Then after an additional 3 incorrect entries the unit is disabled for 1 hour in each case.
The waiting time expires only with the radio and navigation unit (A2/56) switched on.
Inserting and ejecting CD
CDs can be inserted and ejected (audio or navigation CD) in all operating states. After pressing the "eject
button" a CD already inserted is ejected by a motor. If the CD is not removed within approx. 14 seconds, it is
pulled back in automatically.
After inserting a CD it is necessary to push it a slight distance into the CD opening; it is then pulled in the rest
of the way automatically.
When a navigation CD is inserted the menu for entering destination is activated automatically. However,
this applies only when the system has previously requested that the navigation CD be inserted.
The eject button for the CD drive also functions when the radio and navigation unit (A2/56)is in the "code
wait state". This means that a CD can be removed in spite of the request to enter the anti-theft code.
Glossary
AbbreviationMeaningExplanation
AMA mplitude M odulationThe amplitude of the carrier
frequency is modulated with the
signal (e.g. LW, MW and SW
radio)
CDC ompact D iscStorage medium for all types of
data (music, programs,).
D2BD igital D ata B usOptical bus system for transfer of
data via fiber optic cable.
FMF requency M odulationThe signal is transmitted by
changing the frequency of the
carrier (e.g. FM radio)

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 71 © 2006 Mitchell Repair Information Company, LLC.