1997 MERCEDES-BENZ ML320 turn signal

Left rear rpm sensor (L6/3) (model 168)
Wheel speed sensor, left front (L6/1)
Right front rpm sensor (L6/2) (model 208, 210)
Left front rpm sensor (L6/1) and right front rpm sensor (L6/2) (models 203, 209)
The evaluation of the wheel speed signals reveals the mileage covered.
The wheel speed signals of the not driven wheels are evaluated, since their slip between the roadway and tire
is lower, which results in a more accurate result when calculating the mileage.
Calculation of the vehicle orientation
The navigation computer calculates the direction in which the vehicle is traveling (compass direction) from the
data from the gyrosensor and the sequence of locations calculated with the aid of the global positioning system
(GPS). The difference in the calculated mileage and the mileage actually covered between 2 turn-off points is
used to automatically recalibrate the tire circumference (necessary due to tire wear).
Calculation of the direction of motion
The navigation processor recognizes the direction of motion (forward or reverse) from the reverse signal.
Calibration of tire circumference
As a matter of principle, the navigation system recalibrates itself while driving as described. However, this may
require driving a longer distance. After changing tires, manual recalibration should therefore be accomplished.
To do this, it is necessary to enter the tire size (e.g.:195/050/015)and possibly the following information:
new tires (tread depth > approx. 5 mm)
used tires (tread depth < approx. 5 mm)
The entry can be done two different ways:
With aid of STAR DIAGNOSIS.
By calling the "Navigation --> TIRE" menu at the radio (A2)
Errors due to vehicle movement with switched off ignition lead to an inaccurate basic location finding.
Rolling backwards without the reverse gear engaged is evaluated as forwards motion, and may lead to an error
in the location finding. Rolling with the ignition switched off or vehicle transportation also falsify map
matching.
The errors are, however, corrected automatically after a short time by the navigation processor after
receiving GPS data.
A special calibration drive by driving around a defined test path is not ever required.

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 80 © 2006 Mitchell Repair Information Company, LLC.

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

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 82 © 2006 Mitchell Repair Information Company, LLC.

Fig. 54: Display Layout Of Radio (A2) During Navigation - Shown On Model 203
When traveling within the digitized map area, the following information calculated by the navigation processor
is available to the user (partially to be called with "I" (INFO) button):
Route list indicating the distance to be driven on the affected streets or roads
Distance to destination and estimated time of arrival (the time must be set correctly for this purpose).
Driving recommendations
Arrow indicating the driving direction
Current location, in other words name of city and street, latitude and longitude
Name of the next road into which the vehicle should turn
Distance to next turning point specified in units of length or as bar graph (3)
The navigation processor generates graphic signals for the navigation system symbols.
Actual route guidance is supported by voice output via the vehicle loudspeakers.
GUIDANCE IN DIGITIZED MAP AREA, FUNCTION - GF82.61-P-4000GI
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
When driving within the digitized map area the following information is available to the user:
Current position and vehicle route on digital map (illustrated in figure)
Distance from destination and anticipated time of arrival
Destination guidance in
non-digitalized map area,
function GF82.61-P-4001C

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 93 © 2006 Mitchell Repair Information Company, LLC.

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
me
Saturday, October 02, 2010 3:30:05 PMPage 94 © 2006 Mitchell Repair Information Company, LLC.

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.

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 information about company and private ground,
farms, housing estates and agricultural roads.
Gyrosensor
The gyrosensor determines the direction change of the vehicle. It is installed in the navigation processor .
Calibration is not required.
RADIO AND NAVIGATION UNIT, LOCATION/PURPOSE/DESIGN/FUNCTION - GF82.61-P-4109A
MODEL 163,168,170, 208, 210 with CODE (353) Audio 30 APS
Fig. 59: Identifying Radio And Navigation Unit

Radio and navigation
unit, location GF82.61-P-4109-01A
Radio and navigation
unit, purposeRadio reception and
operation
Input/output and control
unit for navigation
Amplification of audio
signals
Control of integrated CD
player and (optional) CD
changer (A2/6)

Radio and navigation
unit, design GF82.61-P-4109-03A
Radio and navigation
unit, function GF82.61-P-4109-04A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:05 PMPage 104 © 2006 Mitchell Repair Information Company, LLC.

Audio 30 APS operating
notes GF82.61-P-0002-03A
Audio 30 APS location of
componentsModel 163GF82.61-P-0002-01D
Model 168GF82.61-P-0002-01B
Model 170GF82.61-P-0002-01A
Models 208, 210GF82.61-P-0002-01C
Audio 30 APS diagnosis,
previous knowledge AD82.61-P-2001A
Battery voltage 11-14V
Troubleshooting
Complaint Cause Note Remedy
Radio and navigation
unit (A2/56) completely
inoperativeFuse in A2/56, Voltage
supply for A2/56, Defect at
navigation CD-ROM,
A2/56 AD82.61-P-6001-01A
No communication
possible between Hand-
Held Tester (HHT) and
Audio 30 APSK line, Radio and
navigation unit (A2/56) AD82.61-P-6001-02A
Navigation inoperative Navigation CD-ROM is not
loaded or is incorrectly
loaded or incorrect /
defective CD-ROM
Radio and navigation unit
(A2/56) Load navigation CD,
refer to:
GF82.61
-P-0002-03A
Destination finding
system messages are
given too early or too late
(e.g. "please turn right")Check wheel calibration
and variant coding AD82.61-P-2001-03A
The expected arrival
time is not correctTime on radio and
navigation unit (A2/56) is
incorrectly set Actuate "NAV"
pushbutton and activate
"CLOCK" menu, set
time
Navigation is defective
or impreciseCheck variant coding and
wheel calibration,
Reversing signal,
Wheel speed signal,
Models 163, 168, 208.3,
210:
Cellular telephone and GPS
roof antenna (A2/49),
Models 170, 208.4:
GPS rear antenna
(A2/23a2) Models 163, 168, 170
Models 208, 210Refer to:
AD82.61
-P-2001-03A
AD82.61
-P-6001-04A
AD82.61-P-6001-04B
AD82.61
-P-6001-03A
AD82.61-P-6001-05A

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:08 PMPage 222 © 2006 Mitchell Repair Information Company, LLC.

TESTING & REPAIR
TESTING AND REPAIR WORK: PASSENGER CARS: ELECTRICAL SYSTEM BODY - AR82.00-Z-9163AA
MODEL 163
Battery voltage 1114 V
Fuses in order
Radio in order
Testing
1Voltage supply, testing
electrical system, CD changerModels 202, 208, 210
up to 05/98 and models
124, 168AD82.64-P-6000-01A
2Voltage supply, testing
electrical system, CD changerModels 163AD82.64-P-6000-01B
3Voltage supply, testing
electrical system, CD changerModels 129, 202, 208,
210 as of 6/98AD82.64-P-6000-01C
4Operating function, testing
electrical system, CD changer AD82.64-P-6000-02A
Removing and
installing bulbs o
f
headlamp unit
MODEL 163.113/136 /154 /172 /174 up to
31.8.01AR82.10-P-
1201GH
Remove/install
fog lamp bulbMODEL 163.113/128 /136 /154 /157 /172 /175
with CODE (U49) Styling package MODEL
163.174AR82.10-P-
1825GH
Remove/install
fog lamp bulbMODEL 163...AR82.10-P-
1825GI
Remove/install
headlight beam
adjustment
control moduleMODELS 163.154 /172 /113 with CODE (612b)
Xenon headlamp unit MODELS
163.174 /175 /128/157AR82.10-P-
4081GH
Remove/install
electric headlamp
range adjustment
motorMODEL 163.154 /172 /113 with CODE (612)
Xenon headlamp unit MODEL
163.174 /175 /128/157AR82.10-P-
4082GH
Remove/install
xenon headlamp
control unitMODEL 163...AR82.10-P-
4632GH
Remove/install
xenon headlamp
control unitMODEL 163.113 #X as of 754620,
163.113 /154 /174 #A as of 289565,
163.128 /157 /175AR82.10-P-
4632GI
Remove/install
turn signal lampsMODEL 163...AR82.10-P-
4725GH

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:08 PMPage 249 © 2006 Mitchell Repair Information Company, LLC.