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Home >> Mercedes Benz >> 2008 >> C 350 4MATIC (204.087) (CAN) V6-3.5L (272.971) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Description and Operation >> GF82.60-P-2003CW Volume/Tone Adjustments, Function

GF82.60-P-2003CW Volume/Tone Adjustments, Function



GF82.60-P-2003CW Volume/Tone Adjustments, Function
- with CODE (523) MB Audio 20 radio
- with CODE (510) Audio 20 with CD changer


Function requirements
^ Status "circuit 30 ON" or "circuit 15R ON"
^ The radio is authorized and in perfect working order
^ Audio source in operation

General
All volume and tone settings are performed using the radio (A2). This happens either automatically through the radio, e.g. through the speed-dependent volume control (SDV [GAL]) or the dynamic range optimization (DRO), or by the user. The volume and sound setting function can be conducted as follows:
^ Function sequence for general volume setting and general, extended tone settings over the left multifunction steering wheel button group (S110) or the right multifunction steering wheel button group (S111)
^ Function sequence for general volume setting and general, extended tone settings over the control buttons and radio rotary actuators
^ Function sequence for general volume setting and general, extended tone settings over the Audio/COMAND control panel (A40/9)
^ SDV (GAL) function sequence, except code (810) Sound system
^ DRO function sequence with code (810) Sound system

Along with the general tone settings the radio can also control, e.g. bass, treble, balance and faders, over extended tone settings. These are:
- Ambient, with code (810) Sound system
- Surround, with code (810) Sound system

Operating instructions
The volume and tone can be set using the following components:
^ With the multifunction steering wheel button groups
^ Using the radio's control buttons and rotary actuator
^ Using the Audio/COMAND control panel

The volume and tone settings are shown on the Audio/ COMAND display (A40/8). Predefined settings can be selected and reset to the manufacturer default setting via the system settings.

Function sequence for general volume setting and general, extended tone settings over the multifunction steering wheel button groups
Pressing the + and - button for adjustment of specific functions and volume control (S111s1) enables the volume for the desired audio function to be increased or reduced.

Selecting the "Sound" menu using the multifunction steering wheel button groups enables general or extended tone settings to be made. The control signals are forwarded via the following path to the radio:
^ Steering LIN
^ Steering column module control unit (N80)
^ Chassis CAN
^ Instrument cluster (A1)
^ Interior CAN

After evaluating the control signal, the desired settings for vehicles with code (810) Sound system are transmitted over the Media Oriented System Transport (MOST) to the sound system amplifier control unit (N40/3) and then emitted at the speaker system.

For vehicles except code (810) Sound system, the selected settings are processed internally, amplified and then emitted at the speaker system.

Function sequence for general volume setting and general, extended tone settings over the control buttons and radio rotary actuators
Operating the radio's rotary actuator enables the volume to be raised or lowered for the desired audio function. Pressing the "Tone setting" button on the radio, enables the user to make all the general or extended tone settings. The control signals are read in and evaluated within the radio. The desired settings for vehicles with code (810) Sound system are sent over the MOST to th sound system amplifier control unit and then emitted at the speaker system.

For vehicles except code (810) Sound system, the selected settings are processed internally, amplified and then emitted at the speaker system.

Function sequence for general volume setting and general, extended tone settings over the Audio/COMAND control panel
Selecting the "Sound" menu over the Audio/COMAND control panel, enables general or extended tone settings to be made. The control signals of the Audio/COMAND control panel are forwarded over the telematics CAN to the radio.

Function sequence for speed-dependent volume control (SDV), except code (810) Sound system
The speed-dependent volume control can be used to adapt the volume to the noise level in the vehicle interior. In this case, the speed signal is used as the reference value. This procedure will run automatically. After evaluating the relationship indicator, the audio output is matched to the noise level in the vehicle interior.

Depending on the vehicle speed signal, the radio raises or lowers the output level of the audio signals (speed-dependent volume control). The output signals are forwarded via the following path to the speaker system:
^ Instrument cluster
^ Interior CAN
^ Radio
^ Discrete line

Function sequence for Dynamic Range Optimization (DRO), with code (810) Sound system
The dynamic range optimization can be used to adjust the volume to the noise level prevalent inside the vehicle. In the process the vehicle speed signal and signal input at the sound system microphone (B25/6) are used as relationship indicators. This procedure will run automatically.

Depending on the noise level the audio signal output level is increased or reduced by the sound system amplifier control unit. The output signals are forwarded via the following path to the speaker system:
^ Sound system microphone
^ Discrete line
^ Sound system amplifier control unit





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