CD changer MERCEDES-BENZ ML430 1997 Complete User Guide

Short-circuit resistance
Zero potential connection of components
No oxidation
Low weight of fiber optical cable
Minimum diameter of wiring harness
The digital data bus (D2B) has a closed ring structure. The communication and data components are arranged
here in a distributor line (in-series circuit). This arrangement is type specific and is illustrated by way of an
example on model 220 as follows:
Radio (A2)
CD player with changer (in trunk) (A2/6), with code (819) 6-disc CD changer
Sound amplifier (A2/13), with code (810) Sound System
Voice control system control unit (A35/11), with code (813) voice control system (VCS)
Telephone and TELE AID transmitter/receiver, D2B (A35/17), with code (855) TELE AID
Data transfer is conducted here in one direction only, i.e. the optical pulses for the voice control system control
unit (A35/11), for vehicles with code (813) voice control system (VCS), on model 220 pass through all
components connected to the ring, before arriving at the target components.
When the system is first put into operation, a system test is performed. In doing so the individual components
and their sequence in the ring structure of the Digital Data Bus (D2B) are registered by the component with the
master function.
A type-specific sequence is stored ex-factory. In turn, the storing of a sequence ex-factory means: if the radio
(A2) is taken from one model series and installed into another one, then during a system test the different
sequence of the components and an error message are filed in the diagnostic trouble code memory.
An error message is also filed if the radio (A2) is exchanged within a model series with different equipment
components. The system goes to the operational state regardless of the error message. STAR DIAGNOSIS
enables the sequence of the components to be subsequently altered in the Digital Data Bus (D2B).
The Digital Data Bus (D2B) is diagnosis capable via the data link connector (X11/4), except for models 129
and 202.
The operating principle of the Digital Data Bus (D2B) is the same for all model series; all that changes is the
sequence of components depending on the national version and equipment specification.
TABLE OF CONTENTS, FUNCTION DESCRIPTION OF DIGITAL DATA BUS (D2B) - GF82.00-P-0999ZZ
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
Data transfer, function GF82.00-P-2000A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:04 PMPage 11 © 2006 Mitchell Repair Information Company, LLC.

Exemplified on model 215 with code (819) 6-disc CD changer, with code (810) Sound System and with
code (382) MB phone "CTEL" in console on right side of dome
Fig. 7: Identifying Fiber Optic Cable, Location/Task/Function

SURVEY OF SYSTEM COMPONENTS, DIGITAL DATA BUS (D2B), LOCATION/ TASK/DESIGN/FUNCTION - GF82.00-P-
9999A
MODEL 129 as of 1.6.98, 163, 168 as of 1.9.98, 170, 202 as of 1.6.98, 203, 208, 210 as of 1.6.98, 215, 220
Fiber optic cable, locationModel 129GF82.00-P-4000-01D
Model 163 as of 01.09.01GF82.00-P-4000-01GH
Model 168GF82.00-P-4000-01E
Model 170GF82.00-P-4000-01C
Model 202, 208GF82.00-P-4000-01B
Model 203GF82.00-P-4000-01G
Model 210GF82.00-P-4000-01A
Models 215, 220GF82.00-P-4000-01F
Fiber optic cable, purposeThe fiber optical cable is
responsible for the optical
data transfer of the
components located at the
digital data bus (D2B).
Fiber optic cable,
function GF82.00-P-4000-04A
Fiber optic cable, Except model 208.4GF82.00-P-4000A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:04 PMPage 15 © 2006 Mitchell Repair Information Company, LLC.

manual station search is activated by actuating the "joystick "to left or right. The station search feature
stops at the next station found, even when the" joystick " continues to be actuated.
Automatic station search with scan function can be activated by pressing the multifunction " Scan " key.
Each station received in the frequency range is played for approx. 8 s This function is possible only in
the forward direction. When activated " Scan " appears inverted on the display.
Manual fine coordination
The frequency can be changed when the" joystick " is moved up or down.
Station selection from memory
For each frequency range (memory FM, AM ) there are 10 memory buttons available. Press button of
number block approx. 2 s to store a station. When a station is stored it is confirmed by an acoustic signal.
Any station stored previously is written over.
In the frequency range WB (weather forecast) 7 stations are preset. These stations can be called by
momentarily pressing the desired number of the number block.
Station selection with frequency input via number block Pressing the" *" button followed by actuation of
the number keys allows direct entry of the desired frequency. Undesired entries can be erased with the"
Clear " button.
Station selection from the FM or AM station list by pressing the multifunction key" List " all stored
stations in the momentary frequency range are listed. Exit station list by pressing FM or AM
multifunction key .
Automatic storage
The "Auto" multifunction key (when pressed for longer than 2 s ) starts automatic storage of the 10
strongest stations in the corresponding frequency range. The stations are stored according to the strength
of the received signals in decreasing order.
CD-PLAYER MODE, FUNCTION - GF82.60-P-2002B
MODELS 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
CD's can be played on the CD drive integrated into the radio and navigation unit (A2/56) or with the CD player
with changer (in glove compartment) (A2/6). The audio data are transmitted over the Digital Data Bus (D2B).
The CD disk drive is a double-speed standard CD disk drive, which is suitable both for pla
ying back audio CDs
Volume/tone adjustments,
function GF82.60-P-2003GI
Antenna system (AS),
location of components GF82.62-P-0001-03D
FM/AM antenna amplifier,
location/purpose/
design/function GF82.62-P-4101A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 62 © 2006 Mitchell Repair Information Company, LLC.

and for reading and loading navigation data from navigation data CDs.
A special navigation CD must be inserted for navigation purposes.
The CD player integrated into the radio and navigation unit (A2/56) provides the following audio functions:
Fast forward or reverse (music search) The music played is audible during fast forward or reverse.
"Scan" function
Each track on a CD is played for 8 s. After a complete run through, the scan function is automatically
terminated.
"Random" function
All the tracks on a CD are played according to a random selection.
"Repeat" function
The current track is repeated.
"Display" function
The number and elapsed playing time for the current track, the total playing time and the number of tracks
on the CD are displayed.
Each CD includes a permanently stored table of contents (TOC record). The table of contents (TOC entry)
contains information such as the number of tracks on a CD and the CD's total playing time.
CD playback is automatically interrupted by the following functions (pause function):
Traffic messages and public warning messages over the radio data system (RDS)
Incoming telephone calls
CD playback is continued at the position at which the interruption took place. No part of the track is skipped
during the pause function.
The CD playback volume is only reduced during navigation system voice output.
CD player with changer,
location/task/design/ functionModels 209.3/4GF82.64-P-3113Q
Models 203.0/2/7
with code (819) CD
changer 6 discGF82.64-P-3113PA
Models 163, 208,
210 with code (819) GF82.64-P-3113B

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 63 © 2006 Mitchell Repair Information Company, LLC.

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, 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.