Mercedes-Benz ML320. Manual — part 233

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

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

Fig. 40: Identifying Audio 30 APS Block Diagram

AUDIO 30 APS OPERATING INSTRUCTIONS - 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 And Navigation Unit Controls

2001 Mercedes-Benz ML320

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

me

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

Abbreviation

Meaning

Explanation

AM

A mplitude M odulation

The amplitude of the carrier
frequency is modulated with the
signal (e.g. LW, MW and SW
radio)

CD

C ompact D isc

Storage medium for all types of
data (music, programs,).

D2B

D igital D ata B us

Optical bus system for transfer of
data via fiber optic cable.

FM

F requency M odulation

The 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