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Mercedes-Benz ML320. Service manual - part 234

GPS

G lobal P ositioning S ystem

System for position finding with
the aid of satellites

GSM

G lobal S ystem for M obile or
also G lobal S tandard of M obile
communication

International standard for mobile
telecommunication.

L ong W ave

Certain relatively low frequency
range within which radio signals
are transmitted (compare UHF and
MW).

M edium W ave

Certain frequency range within
which radio signals are transmitted
(compare UHF and LW).

POI

P oints of I nterest

Locations of geographic or tourist
interest.

PTY

P rogram Ty pe

RDS feature describing the
program contents of the radio
station (pop, culture, classics,)

RDS

R adio D ata S ystem

Standard for transmission of
information via FM radio station
(station name, e.g. SWR3 or
program type (see PTY),)

TCS

T raffic C enter S ervice

Standard for transmission of
traffic information via cellular
telephone network. Presently not
used by Audio 30 APS (status:
3/99)

TMC

T raffic M essage C hannel

Standard for FM / RDS
transmission of traffic
information. Presently not used by
Audio 30 APS (status: 3/99)

Traffic Program

RDS feature. Indicates that the
station tuned in is a traffic station.

UKW

Ultra-high frequency

Certain frequency range within
which radio signals are transmitted
(relatively high frequency,
compare LW and MW).

Destination entry

Entry of town and street name for
desired trip destination.

Guidance

Function of navigation system.

Other terms:
Intermediate frequency

The IF signal is required for the
antenna diversity function. With
this function the antenna with the
best reception is automatically
selected on vehicles with a system
of FM antennas. This function is

2001 Mercedes-Benz ML320

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

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



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
components

Model 163

GF82.61-P-0002-01D

Model 168

GF82.61-P-0002-01B

Model 170

GF82.61-P-0002-01A

Model 208, model 210

&.2.(GF82.61-P-0002-
01C)

Audio 30 APS block
diagram

Model 163

GF82.61-P-0002-02D

Model 168

GF82.61-P-0002-02B

2001 Mercedes-Benz ML320

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

TABLE OF CONTENTS, FUNCTION DESCRIPTION OF AUDIO 30 APS - GF82.61-P-0998ZZ

MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS

Model 170

GF82.61-P-0002-02A

Models 208, 210

&.2. (GF82.61-P-0002-
02C)

Audio 30 APS operating
instructions

GF82.61-P-0002-03A

On/Off behavior, function

GF82.85-P-2006B

Navigation mode, function

GF82.85-P-2012B

Radio mode, function

GF82.60-P-2001B

CD player mode, function

GF82.60-P-2002B

Volume and tone settings,
function

GF82.60-P-2003B

Digital data bus (D2B),
function

GF82.00-P-0001A

Radio and navigation unit,
location/purpose/
design/function

GF82.61-P-4109A

Audio 30 APS, function

Models 163, 168,
170, 208, 210

GF82.61-P-0002A

Model 203, 209.3/4 GF82.61-P-0002E

Audio 30 APS location of the
components

Model Series 163

GF82.61-P-0002-
01D

Model 168

GF82.61-P-0002-
01B

Model 170

GF82.61-P-0002-
01A

Models 203, 209.3

GF82.61-P-0002-
01E

Model 209.4

GF82.61-P-0002-
01F

Models 208, 210

GF82.61-P-0002-
01C

Audio 30 APS block diagram

Model Series 163

GF82.61-P-0002-
02D

Model 168

GF82.61-P-0002-
02B

Model 170

GF82.61-P-0002-
02A

Models 203, 209

GF82.61-P-0002-
02E

2001 Mercedes-Benz ML320

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

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