1997 MERCEDES-BENZ ML320 Complete Repair Manual

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Page 1593 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual well as the surrounding area.
Traffic information analysis
In both cases (TCS or TMC) the traffic data recorder decodes the traffic information and forwards it when
requested to the navigation com

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MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 Na

Page 1595 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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
Na

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MERCEDES-BENZ ML320 1997 Complete Repair Manual 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

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.

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 101 © 2006 Mitchell Repair Information Company, LLC.

Page 1597 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 ca

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

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 102 © 2006 Mitchell Repair Information Company, LLC.

Page 1598 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual 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 synchro

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
me
Saturday, October 02, 2010 3:30:05 PMPage 103 © 2006 Mitchell Repair Information Company, LLC.

Page 1599 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual Map data.
The digitized map area on the CD-ROM contains towns, cities, streets, intersections and their attributes (e.g.:
one-way streets, turn prohibitions, ...). It does not contain informatio

Page 1600 of 4133

MERCEDES-BENZ ML320 1997 Complete Repair Manual RADIO/NAVIGATION MODULE , LOCATION/PURPOSE/DESIGN/FUNCTION - GF82.61-P-4109GI
MODEL 163 as of 1.9.01 with CODE (522) Modular cont rol system (MCS) radio USA with CODE (357)
Navigation system - addi

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