radio code MERCEDES-BENZ ML320 1997 Complete Owner's Manual

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
AbbreviationMeaningExplanation
AMA mplitude M odulationThe amplitude of the carrier
frequency is modulated with the
signal (e.g. LW, MW and SW
radio)
CDC ompact D iscStorage medium for all types of
data (music, programs,).
D2BD igital D ata B usOptical bus system for transfer of
data via fiber optic cable.
FMF requency M odulationThe 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
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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)

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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 170GF82.61-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, functionModels 163, 168,
170, 208, 210GF82.61-P-0002A
Model 203, 209.3/4GF82.61-P-0002E
Audio 30 APS location of the
componentsModel Series 163GF82.61-P-0002-
01D
Model 168GF82.61-P-0002-
01B
Model 170GF82.61-P-0002-
01A
Models 203, 209.3GF82.61-P-0002-
01E
Model 209.4GF82.61-P-0002-
01F
Models 208, 210GF82.61-P-0002-
01C
Audio 30 APS block diagramModel Series 163GF82.61-P-0002-
02D
Model 168GF82.61-P-0002-
02B
Model 170GF82.61-P-0002-
02A
Models 203, 209GF82.61-P-0002-
02E

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CONSTANT MAP MATCHING, FUNCTION - GF82.61-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
Models 208, 210GF82.61-P-0002-
02C
Audio 30 APS operating instructionsModels 163, 168,
170, 208, 210GF82.61-P-0002-
03A
Model 203, 209GF82.61-P-0002-
03E
Switch on/off behavior, function GF82.85-P-2006B
Navigation mode, functionModels 163, 168,
170, 208, 210GF82.85-P-2012B
Model 203, 209GF82.85-P-2012EE
Radio operation, function GF82.60-P-2001B
CD-player mode, function GF82.60-P-2002B
Telephone mode, functionModel 209GF82.85-P-2007QA
Volume/tone adjustments, function GF82.60-P-2003B
Loading language, function GF82.61-P-3003B
Basic location finding, function GF82.61-P-3006D
Global positioning system location
finding, function GF82.61-P-3007C
Map-supported location finding,
function GF82.61-P-3008C
Route calculation, function GF82.61-P-3011E
Destination guidance, function GF82.61-P-3012D
Destination guidance in digitalized map
area, function GF82.61-P-4000C
Destination guidance in non-digitalized
map area, function GF82.61-P-4001C
Dynamic route guidance, function GF82.61-P-4003QA
Survey of system components, Audio
30 APS, location/task/design/function GF82.61-P-9998ZZ

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by the navigation processor Integrated Into the radio and navigation module (A2/56) .
During the switch-on phase (software is loaded), only basic map matching is available.
When the ignition is switched off all important location finding parameters are stored for the duration of the
shut-off delay (approx. 60 min) .
The permanent location finding feature uses three procedures which supplement each other ensuring very
precise and reliable location finding:
Basic location finding (dead reckoning)
Map-supported location finding (map matching)
GPS location finding
Manual entry of vehicle location
It is possible to enter the location manually on the operating and display module. This can be useful in the
following cases:
Following vehicle transport
(e.g. ferry or train) or
when GPS reception is not present when trip is started
LOADING LANGUAGE, FUNCTION - GF82.61-P-3003B
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
Function
The data for navigation voice output is stored originally on the navigation DVD. They are transmitted with the
help of the DVD drive of the radio (A2) into the memory of the navigation processor and are then available
anytime for navigation.
The language is reloaded in the following cases:
Basic location finding,
function GF82.61-P-3006GI
Global positioning system
location finding, function GF82.61-P-3007GI
Map-supported location
finding, function GF82.61-P-3008GI
Radio and navigation
module, location/purpose/
design/function GF82.61-P-4109GI

2001 Mercedes-Benz ML320
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automatically, after voltage to the radio (A2) was interrupted
manually, by activating the "SPRA" menu in the navigation mode
Loading the language requires approx. 20 s.
If the system is switched off while loading the language, the language data is lost and must be reloaded again.
Avoid strong vibrations to the vehicle (e.g. extremely bumpy roads) while the language is being loaded.
The navigation processor is integrated in the radio (A2).
BASIC LOCATION FINDING, FUNCTION - GF82.61-P-3006D
MODELS 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
Basic representation of the basic location finding shown on model 210
Basic location finding (dead reckoning) is the basic function of continuous location finding. It is permanently
carried out by the navigation processor that is integrated in the radio (A2) when the ignition is switched on
(approx. once per second) and is irrespective of the data of the DVD map. After switching off the ignition, the
current position is stored for the duration of the system shut-off delay time.
Fig. 46: Identifying Basic Location Finding Function

The following information is calculated with the aid of basic location finding:
Distance traveled
Absolute vehicle direction (compass direction)
Direction of travel (forward or reverse)
Calculation of distance traveled
The navi
gation processor receives the wheel speed signal of the following components:
Route calculation,
function GF82.61-P-3011E

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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BASIC LOCATION FINDING, FUNCTION - GF82.61-P-3006GI
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. 47: Identifying Basic Location Finding, Function

Basic location finding (dead reckoning)
Is the basic function of permanent location finding It is accomplished permanently by the navigation processor
when the ignition is switched on and is not dependent on the CD-ROM map.
The current position is stored after the ignition is switched off.
The following information is calculated with the aid of basic location finding :
Distance traveled
Direction of motion (forward or backward) and
Direction in which vehicle is pointing
Basic location finding is accomplished approx. once per second .
Distance traveled
The navigation processor receives the signals output by the front right wheel speed sensor (L6/2) from the
traction system control module (N47) via discrete leads.
Evaluation of the wheel speed signals allows calculation of the distance traveled.
Direction of motion
Map-supported location
finding, function GF82.61-P-3008C

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The navigation processor recognizes the direction of motion (forward or reverse) from the reverse signal.
Direction in which vehicle is pointing
From the data of the gyrosensor and the sequence of the locations calculated with GPS the navigation
processor the calculates the direction in which the vehicle is pointing (compass direction).
The difference between calculated and actual distance traveled between two turning points is used for automatic
recalibration of the tire circumference (required due to tire wear).
Location finding errors during basic location finding
Rolling backwards without the reverse gear engaged is evaluated as forward motion, and may lead to an error in
the location finding.
Rolling with the ignition switched off or vehicle transportation also falsify map matching.
In both cases the deviation is automatically corrected by the navigation processor after receiving GPS data .
Calibration
Wheel calibration is not required following tire change.
GLOBAL POSITIONING SYSTEM LOCATION FINDING, FUNCTION - GF82.61-P-3007C
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
Basic representation of the GPS location finding shown on model 210
Global positioning system
location finding, function GF82.61-P-3007GI
Map-supported location
finding, function GF82.61-P-3008GI
Guidance, function GF82.61-P-3012GI
Radio and navigation
module, location/purpose/
design/function GF82.61-P-4109GI

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In addition, the vehicle's course of travel is determined with the aid of the sequence of the locations calculated
with GPS.
Possible interference when receiving GPS signals
Since GPS operates in the GHz range (microwaves) and the signals are weak, reception interference can occur
as the result of:
atmospheric interference, e.g. weather, water vapor, fog
multiple reception resulting from reflecting of signals, e.g. from building walls
Signal shadows, e.g., in built-up areas, tunnel, in the proximity of higher buildings and trees
GPS reception therefore necessitates a clear view of the sky. The location finding accuracy of the GPS system is
100 m or better.
GLOBAL POSITIONING SYSTEM LOCATION FINDING, FUNCTION - GF82.61-P-3007GI
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. 49: Identifying Global Positioning System Location Finding

General
The global positioning system (GPS) is a satellite-supported location findin
g system. It is not subject to fees
GPS/CTEL roof antenna
location/task/design/ functionModels 163,
168,208.3,210GF82.70-P-4111A
Global positioning system antenna,
location/ task/design/functionModels 170, 208.4GF82.61-P-4106A
Models 203, 209.3GF82.61-P-4106E
Model 209.4GF82.61-P-4107Q
Antenna splitter,
location/task/design/functionModel Series 163GF82.85-P-3107B

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MAP-SUPPORTED LOCATION FINDING, FUNCTION - GF82.61-P-3008C
MODEL 163, 168, 170, 203.0 /2 /7, 208, 209.3 /4, 210 with CODE (353) Audio 30 APS
Basic representation of the map-supported location finding shown on model 210
Map-supported location finding (map matching) is available only in the digitized area of the DVD map.
A deviation can be recognized and corrected automatically by comparing the calculated position of the vehicle
with the possible positions on the DVD map.
Fig. 50: Identifying Map
-Supported Location Finding Function
Function
The position of the vehicle is continuously followed on the DVD map by the navigation processor. A number of
alternative routes are calculated preliminarily in the digitized area of the DVD map. If the route driven varies
from one of the possible routes, the position coordinates for basic location finding are corrected where
necessary.
The navigation processor is integrated in the radio (A2).
Loading the DVD map data
The navigation processor has a read/write memory (RAM) for storing the DVD map data. However, this
memory is not large enough to store the entire DVD map (currently approx. 10 %). For this reason, the
navigation processor loads into the memory only the map data required for route guidance.
Here, different storage methods are used depending on whether the destination is in the near vicinity of the
vehicle or further away:
The followin
g methods are used to store the data:
location/purpose/
design/function

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