1997 MERCEDES-BENZ ML500 radio

analog filters, digital filters contain the following significant advantages:
the filter parameters (sound settings) do not alter throughout the period, this thus means that all the
settings can be repeated exactly
low noise level
the component outlay is significantly reduced, as the filter parameters are set by the software and not by
varying component values (resistances, capacitances or inductance values), thus the number of possible
filter settings is increased
Sound optimizations
Each of the six amplifier channels is equipped with an individual compensation, which can, when requested,
rectify the vehicle's acoustics. In addition further sound optimization settings can be made and effects such as,
e.g. 'voice emphasizing' or 'stereoscopic sound' invoked.
Bass, treble, volume, balance, fader and the dynamic loudness function can be individually set.
Noise suppression
The output level of the six 6 output stages is constantly monitored and regulated such that distortion is kept to a
minimum.
Automatic Vehicle Noise Compensation (VNC))
With the aid of the sound amplifier microphone (B25/6) , which is connected directly to the sound amplifier
(A2/13) , the noise level in the vehicle is measured. The volume of the music output signal is constantly adapted
to this noise level. To this end the sound amplifier (A2/13) must be able to detect which of the measured
signals are noise emissions from the moving vehicle and which are audio signals. This is conducted by
comparing the output signal of the sound amplifier (A2/13) with the measured signal.
Put simply, the vehicle noise level is the difference between the two signals.
Diagnosis
The sound amplifier (A2/13) can set up the following messages which are relevant for the diagnosis:
Operating status
Undervoltage
Internal fault in the sound amplifier (A2/13)
The messages are sent over the digital databus ( D2B ) to the COMAND operating, display and control
module (A40/3) or the radio (A2) , and can be read out there over the ( K-wire ) diagnostics line.
SOUND AMPLIFIER, LOCATION/TASK/DESIGN/FUNCTION - GF82.62-P-3100GH
MODEL 163 with CODE (810) sound system

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
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REAR WINDOW ANTENNAS, DESIGN - GF82.62-P-3106-03GH
Model 163
Antenna ranges
Sound amplifier,
position GF82.62-P-3100-
01GH
Sound amplifier, taskProcessing (sound settings)
and amplification of all audio
signals (radio, cassette, CD,
navigation voice command,..)
Sound amplifier, designDigital databus interface
(D2B)
Connection for sound
amplifier microphone
(B25/6) for automatic
vehicle noise
compensation
Digital filter technology
outputs distributed
across following
loudspeaker groups:
Treble
Medium treble
Medium bass
Bass

These are distributed as
follows:
Left front
Right front
Left rear
Rear right
Center
Woofer

Sound amplifier,
function GF82.62-P-3100-
04GH

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 115 © 2006 Mitchell Repair Information Company, LLC.

Fig. 68: Identifying Rear Window Antennas Design
The individual antennas are attached to the inner side of the rear window.
The AM antenna in some cases is part of the heating elements of the rear window defroster. The AM signals
are decoupled by the radio antenna splitter (A2/5) .
All the antennas are matched in terms of their length and shape to the particular frequency band which they
receive.
REAR WINDOW ANTENNAS, FUNCTION - GF82.62-P-3106-04GH
Model 163
Function:
The radio signals are received by the rear window antenna (A2/32) (AM, FM ). The high-frequency
oscillations (RF) of the electrical field in the air are converted into an electrical alternating voltage .
A standing electrical wave is formed in the antenna as a result of the correct matching of the length of the
antenna to the wavelength of the frequency to be received.
In this case, the amplitude of the RF signal has a constant value at a random point of the antenna. The RF
signal level is at the maximum at the connection point. A variation of the length of the antenna from its
optimum length results in a reduction in the RF signal level at the antenna output. If the variation is too large,
no further signal is received (for example if the antennas are incorrectly connected to the antenna amplifier).
REAR WINDOW ANTENNA, LOCATION/PURPOSE /DESIGN/FUNCTION - GF82.62-P-3106GH
MODEL 163

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 116 © 2006 Mitchell Repair Information Company, LLC.

Fig. 69: Identifying Rear Window Antennas Location
FM/AM ANTENNA AMPLIFIER, LOCATION - GF82.62-P-4101-01GH
Model 163
Location:
the FM/AM amplifier (A2/18) is located in the tailgate.
Rear window antennas,
locationThe antennas are located
in the rear window
Rear window antennas,
purposeReception of the
following radio signals:
AM, FM (WB only
)

Rear window antennas,
design GF82.62-P-3106-03GH
Rear window antennas,
function GF82.62-P-3106-04GH

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 117 © 2006 Mitchell Repair Information Company, LLC.

Fig. 70: Identifying FM/AM Antenna Amplifier Location
FM/AM ANTENNA AMPLIFIER, FUNCTION - GF82.62-P-4101-04GH
The radio signals are received by the rear window antenna (A2/32) and passed to the signal input of the
FM/AM amplifier (A2/18) . This amplifies the signals and passes them over a coaxial cable to the receiver of
the radio set of the audio unit.
FM/AM ANTENNA AMPLIFIER, LOCATION/PURPOSE/DESIGN/FUNCTION - GF82.62-P-4101A
MODEL 163, 168, 170, 208.4, 210.2
MODEL 208.3, 210 (except, 210.2) except CODE (352a) COMAND operating and display system
FM/AM antenna
amplifier, locationModel 168GF82.62-P-4101-01A
Model 170GF82.62-P-4101-01B
Model 208GF82.62-P-4101-01D
Model 210 (except 210.2)GF82.62-P-4101-01E
Model 210.2GF82.62-P-4101-01C
Model 163GF82.62-P-4101-
01GH
FM/AM antenna
amplifier, purposeAmplification of the FM/AM
radio signals
FM/AM antenna Coaxial connection for

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 118 © 2006 Mitchell Repair Information Company, LLC.

Fig. 72: Identifying Roof Antenna
SURVEY OF SYSTEM COMPONENTS FOR ANTENNA SYSTEM (ATS), LOCATION/ TASK/DESIGN/FUNCTION - GF82.62-
P-9999GHZ
MODEL 163 as of 1.9.01
Telephone antenna,
locationThe roof antenna (A2/22) is located in
the rear area of the vehicle roof.
Telephone antenna,
purposeConversion of electromagnetic
radio waves into electrical
voltages and vice versa
Transmitting/receiving telephone
signals (data and voice output)
Lobar bundling of the
transmission energy
Detecting the matching frequency
range

Rear window antenna,
location/task/design/ function GF82.62-P-3106GH
FM/AM antenna amplifier,
location/task/design/ function GF82.62-P-4101A
Telephone antenna,
location/task GF82.62-P-4105GH
GPS/telephone roof antenna,
location/task/ design/function GF82.70-P-4111A
E-Call backup antenna, GF82.95-P-4205GH

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 120 © 2006 Mitchell Repair Information Company, LLC.

CD PLAYER WITH CHANGER, LOCATION - GF82.64-P-3113-01GI
The CD player with changer is located behind the access flap in the right side cover of the trunk.
Fig. 73: Identifying CD Player With Changer Location

CD PLAYER WITH CHANGER, FUNCTION - GF82.64-P-3113-02GI
Controlling CD player
The CD player with changer (in trunk) (A2/6) is controlled by the radio and navigation module (A2/56)via
the digital data bus (D2B).
The CD player generates reports on the following operating conditions:
No magazine in CD changer
Magazine assignment (only with music CD)
Number of current CD
Number of current title
List of occupied slots (CDs)
Title number per disc
Current operating state (acoustic playback of radio signals, pause, etc.)
The messages are stored on the digital data bus D2B ) and interpreted by the radio and navigation module
(A2/56) .
CD playback
The audio data is stored digitally on the CD-ROM . The audio CD is driven by a motor in the CD-player with
changer (in trunk) (A2/6) .
location/task
Contents - function description
of antenna system (ATS) GF82.62-P-0999GHZ

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 121 © 2006 Mitchell Repair Information Company, LLC.

The laser-optical device scans the non-labeled side of the rotating CDwithout making contact and converts the
digital optical signals into electrical signals. Small interruptions in the data flow of the laser optics caused by
scratches or contamination on the audio CD are compensated by the D/A converter supplementing the missing
values .
The electrical signals are then decoded in the CD player with changer (in trunk) (A2/6) and transmitted via
the digital data bus ( D2B ) to the radio and navigation module (A2/56) via the audio signal processing or
when the sound amplifier (A2/13) (code 810) is installed to the loudspeakers.
Jumps and interruptions during playback
On bad roads or in the event of heavy vibrations , jumps and interruptions can occur during playback. In
such cases do not start CD mode until better road conditions are present.
In the event of wet weather conditions and strong deviations in the ambient temperatures moisture can collect in
the CD player housing (condensation formation). This could also lead to malfunctions in the playback. In such
cases provide for sufficient ventilation of the CD player and the trunk.
CD PLAYER WITH CHANGER, LOCATION/TASK/DESIGN/FUNCTION - GF82.64-P-3113B
MODELS 163, 208, 210, 215, 220 with CODE (819) 6-disc CD changer
MODELS 208, 210, 215, 220 with CODE (819a) CD changer with CODE (498) Japanese version
Shown on model 220 (as of 1.9.02)
Fig. 74: Identifying CD Changer (In Trunk) Location

CD player with changer,
locationThe CD player with
changer (in the trunk)
(A2/6) is located in the
trunk near the left side
wall.
Model 163GF82.64-P-3113-01GI
Models 208, 210GF82.64-P-3113-01D
Models 215, 220 with GF82.64-P-3113-01F

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
me
Saturday, October 02, 2010 3:30:06 PMPage 122 © 2006 Mitchell Repair Information Company, LLC.