1997 MERCEDES-BENZ ML320 audio

Fig. 53: Identifying Digitized And Non Digitized CD-ROM Map Areas
The road network is indicated in extremely simplified form.
Guidance is the generation and output of driving recommendations, in order to guide the driver to the desired
destination. The prerequisites for route guidance are:
Permanent location finding is in operation (is accomplished automatically),
destination has been entered and
the route has been calculated.
The navigation processor permanently compares the data from route calculation with the data from permanent
location finding using this information for measures for further guidance. Two route guidance operating modes
can be distinguished depending on the vehicle position (see figure):
Guidance within the digitized CD-ROM map area.
Limited guidance outside of the digitized CD-ROM map area.
DESTINATION GUIDANCE IN DIGITALIZED MAP AREA, FUNCTION - GF82.61-P-4000C
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
Display layout of the radio (A2) during navigation, shown on model 203
Guidance in digitized
map area, function GF82.61-P-4000GI
Guidance in non-digitized
map area, function GF82.61-P-4001GI

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Driving direction recommendation
Distance to next turning point (specified in units of length)
The data is determined by the navigation processor and transmitted to the radio and navigation module
(A2/56) The current route guidance is primarily supported by the voice output (English).
The scale of the displayed map can be changed in increments. In addition it is possible to select whether the
map is aligned in the direction of motion Head-Up ) or toward the north North-Up ). The graphical signals for
map illustration is generated by the navigation processor.
DESTINATION GUIDANCE IN NON-DIGITALIZED MAP AREA, FUNCTION - GF82.61-P-4001C
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
When traveling outside of the digitized map area (e.g. company grounds, parking buildings, dirt roads,...),
however still within the DVD map boundaries, the navigation processor switches over to "navigation system in
non-digitized map area".
On the radio (A2) display the following message appears:
"OFF ROAD"
If the vehicle is also outside the DVD map limit, the following message appears:
"OFF MAP"
In both cases, only basic location finding is accomplished with correction using the GPS data.
A (limited) route guidance can be conducted only with specification of the:
Distance from the destination as the crow flies
Direction to the destination (as an arrow)
After reentering the digitized map area, the system automatically continues with "navigation system in digitized
map area". The possible streets/roads on which the vehicle may be located are determined with the aid of GPS
location finding. During this process a slight delay in the route guidance may result.
The road data of several Central European countries are stored on the navigation DVD, so that the "OFF
MAP" message will not appear, if borders between the stored countries are crossed. No special foreign country
DVD has to be inserted.
Voice output, function GF82.85-P-3001GI
Guidance in non-digitized
map area, function GF82.61-P-4001GI

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:05 PMPage 94 © 2006 Mitchell Repair Information Company, LLC.

DYNAMIC ROUTE GUIDANCE, FUNCTION - GF82.61-P-4003QA
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
The current traffic situation is taken into consideration in the dynamic route guidance. The COMAND
navigation system Audio 30 APS can receive information on the traffic situation either by the Traffic Center
Service (TCS) or the Traffic Message Channel (TMC).
The services from the Traffic Center Service (TCS) are offered by an external provider and an application is
to be sent to the provider for use.
Traffic messages via Traffic Center Service (TCS)
The latest traffic situation information is transmitted by a service provider for a fee in the form of an SMS (short
message service) signal via the CTEL D network. The traffic data are only transmitted when the service
provider receives a corresponding request from the vehicle.
The request can be sent either:
Cyclically, every 15 minutes
Once
In order to reduce the data volume the current location of the vehicle is automatically sent to the D network
center when the information request is posted.
The service provider then transmits only traffic messages at within a radius of approx. 75 km of the vehicle. The
telephone system of the vehicle receives the traffic announcements and transmits them via the D2B to the traffic
data recorder that is integrated in the radio (A2).
It is possible to use the telephone during TCS data interchange.
Traffic messages via Traffic Message Channel (TMC)
Information on the current traffic situation is transmitted by a specially equipped radio-broadcast station aimed
at specific areas and coded (toll) or uncoded (toll free) via VHF. For this purpose an appropriate FM/ RDS
station must be tuned in.
The radio (A2) receives the traffic announcements and transmits them to the traffic data recorder. Since no
communication is accomplished between the vehicle and broadcasting corporation with TMC messages, the
traffic data recorder selects the traffic messa
ges related to the route on which the vehicle is presently driving as
Starguide, function GF82.85-P-2014GI
Information service,
function GF82.85-P-3016GI
Data transmission for
Starguide, function GF82.85-P-3017GI

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Fig. 56: Identifying Radio And Navigation Unit - Illustrated On Model 168
RADIO AND NAVIGATION MODULE , LOCATION - GF82.61-P-4109-01GI
Fig. 57: Identifying Radio And Navigation Module - Radio And Navigation Module
RADIO/NAVIGATION MODULE , DESIGN - GF82.61-P-4109-03A
Models 163, 168, 170, 208, 209, 210 with code 353
The Audio 30 APS operating unit is a co mplete radio and navigation system.
It has:
Radio/receiver with 2-tuner technology
a signal input for audio mute
Digital Data Bus interface (D2B)
Display
4-channel amplifier with 4 speaker outputs
CD ROM-disk drive for audio and navigation data CDs
a navigation processor with integrated GPS receiver and gyro sensor
Output of intermediate frequency signal (Z F) for the FM antenna diversity function
Interface of interior CAN (CAN-B) and D2B (Digital Data Bus)

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1998-2005 ACCESSORIES & BODY, CAB Electr ical System - Body - 163 Chassis
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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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The display of the radios (A2) has 197 x 32 pixels. Texts are displayed in 3 lines.
After particular functions are called (e.g. navigation), the bottom line shows a variable inscription for the row of
buttons underneath (multifunction buttons). As a result the system can be operated very conveniently with a few
buttons, as the function which is activated when the button is operated, is shown in plain text (e.g. LANG,
ITEM, DYN, CLOCK etc.).
Audio signal output
The audio signals of the various sources (CD, voice output for navigation etc.) are processed by the radio (A2)
and amplified before output by the vehicle speakers.
On models 168, 170, 208 and 210 with the sound system (code 810) the audio signals are finally amplified
by the amplifier for the sound system (N40/3). For this, the audio source data (low-frequency signals) are
transmitted to the amplifier for the sound system (N40/3) via separate lines.
On models 163 and 209 the final amplification of the audio signal is performed by the sound amplifier
(A2/13). All the data are transmitted via the D2B.
Audio mute
An incoming phone call activates the audio mute function (a separate signal input exists on the radio (A2) for
this). When the audio mute function is activated, the current audio source (e.g. radio) is muted automatically.
Navigation processor, GPS control module and gyrosensor
The navigation processor is the central component of the navigation system.
It is integrated into the radio (A2) and from the incoming signals continuously calculates the location and once
the destination is entered calculates the route for navigation. The GPS receiver is integrated into the navigation
processor. It evaluates the satellite signals and calculates from them the vehicle position in degrees longitude
and latitude. Various GPS antennae are used to receive these signals depending on the vehicle model:
Model 163: telephone and GPS roof antenna (A2/49)
Models 168, 208.3, 210: GPS antenna (A2/49a2)
Models 170, 208.4: GPS rear antenna (A2/23a2)
Model 209: GPS antenna (A2/23)
Reception from at least 3 satellites is necessary for exact GPS position calculation. A free view of the sky is
required for this purpose.
The integrated gyrosensor continuously senses every change in direction of the vehicle. Evaluation of this data
is accomplished by the navigation processor.
Calibration of the gyrosensor is not required.

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DVD drive and DVD
The DVD drive of the radio (A2) reads data from the navigation DVD inserted and makes this available to the
navigation processor via the data bus inside the device.
Audio CDs can also be played.
The following are located on the navigation DVD:
Program data for the navigation computer
Voice segments for voice output
Map data.
A distinction is made between digitized and non-digitized areas within the DVD map area:
Villages, towns, roads, intersections and their attributes (e.g. one-way streets, no turns etc.) are recorded
in the digitized map area.
Included in the non-digitized areas are, for example company/private grounds, farms, small housing
estates, tracks across fields and areas between villages.
No data is available here.
Diagnosis interface (K-line) and fault management of D2B-components
During operation, the system stores all occurring faults in the nonvolatile memory. It is not possible to output
the fault via the display of the radio (A2).
The radio's (A2) fault management also includes the D2B-components connected. For this purpose, each D2B
component has its own DTC memory. The faults are transmitted from the corresponding components via the
D2B to the radio (A2) and can then be read out via the diagnosis interface
RADIO AND NAVIGATION MODULE, FUNCTION - GF82.61-P-4109-04GI
Processing button actuations
The control buttons and switches on the function keypad on the radio and navigation module (A2/56)are read
in via the I/O ports of the microcontroller and transferred to the central processor. Depending on the system
function the button actuations are processed in the central processor or relayed to the other system components
via the digital data bus ( D2B ) in form of a data telegram.
Graphic preparation and image output
The graphics subsystem handles the preparation and output of the operating displays. The operating displays are
output internally to the display by the graphic subsystem via the RGB output ( R =red, G =green, B =blue).
The RGB signal contains information and amplitudes of the three basic colors Red, G reen and Blue as well

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1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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as a synchronization signal. The electronic control in the display unit evaluates the RGB signaland actuates the
individual pixels line by line according to color and intensity.
A horizontal synchronization pulse is output at the end of each line. The electronic circuitry of the display unit
then starts the next line. After reaching the last line on the display, a vertical synchronization pulse is output and
the electronic circuitry starts again with the first line.
Audio signal output
The audio signals from the various sources (CD, voice output for route guidance, ...) are processed by the radio
and navigation module (A2/ 56) and amplified before output over the vehicle loudspeakers . On vehicles
with sound system (code 810) final amplification of the audio signals is accomplished by the sound amplifier
(A2/13) . For this purpose audio source data is transmitted to the sound amplifier (A2/13) via the digital data
bus ( D2B ).
Diagnosis interface (K bus) and D2B component error management
During the radio and navigation module (A2/56) mode the system stores all errors which occur in the non-
volatile memory. These errors can then be read out on the diagnostic interface (K bus) with Star diagnosis .
Output of the errors on the display unit is not possible.
Error management also includes components connected to the digital data bus ( D2B ).
Each D2B component has its own DTC memory . The errors are transmitted to the radio and navigation
module (A2/56) via the digital data bus (D2B) on request by STAR diagnosis and can then be read out with the
diagnostic interface.
Navigation processor and GPS control module
The navigation processor is the central component of the radio and navigation module (A2/56) . It is
integrated into the radio and navigation module (A2/56)and calculates the location and vehicle route from the
incoming signals after entering the route.
The GPS control module is a part of the navigation processor. It evaluates the satellite signals distributed by
the CTEL/GPS roof antenna (A2/49) and the CTEL and GPS antenna splitter (A2/57) and calculates with
this information the vehicle position.
CD-ROM and CD drive
With the aid of the navigation CD drive it is possible to read data from the special navigation CD or play
audio CD's or play .
The following is stored on the navigation CD-ROM :
Program data for execution in navigation processor
Voice data for voice output

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:05 PMPage 103 © 2006 Mitchell Repair Information Company, LLC.