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

GF82.60-P-2003CEA Volume/Tone Adjustments, Function
- with CODE (525) MB Audio 50 APS radio
- with CODE (511) Audio 50 APS with DVD changer

Function requirements, general
^ C. 30g ON or C. 15R ON
^ The auto pilot system (APS) is authorized and working correctly
^ Audio source in operation

The electronic ignition lock control unit (N73) transmits circuit status c. 15 to the interior CAN (CAN B).

Volume/tone adjustments, general
All volume and sound settings are carried out through the radio with auto pilot system (A2/56). This is done either manually by th user or automatically by the radio with auto pilot system, e.g. by the speed-dependent volume control (SDV [GAL]).

The volume and sound 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.

As of 1.6.09: With audio source (via media interface adapter cable (with code (518) Media Interface) or standard AUX socket) it is possible to select "Standard" and "Boost" under menu "Volume". The input level can be increased by selecting "Boost".

On vehicles with code (810) Sound system, the audio unit is provided with a sound setting "Logic 7" (room sound) in addition to the general sound settings (tremble, basses, balance and fader).

On vehicles without code (810) Sound system, the audio signals from the auto-pilot system are relayed to the following speakers via direct line and output from there:
- Left front door speaker (H4/1)
- Right front door speaker (H4/2)
- Left rear door speaker (H4/3)
- Right rear door speaker (H4/4)

On vehicles with code (810) Sound system, the radio with auto-pilot system transmits the audio signals over the media-oriented system transport (MOST) to the sound system amplifier control unit (N40/3). The sound system amplifier control unit processes them and relays them to the following speaker via a direct line:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Center dashboard speaker (H4/27)
- Bass speaker (H4/29) (model 204.0/2)
- Left rear surround speaker (H4/54)
- Right rear surround speaker (H4/57)

On model 204.0 the right rear surround speaker is integrated into the bass speaker. On model 204.9 the audio signals for the rear bass speaker (H4/38) are relayed from the sound system amplifier control unit to the rear bass speaker amplifier (N40/9) and from there to the rear bass speaker via direct line.

The volume setting can be carried out separately for each audio source. Predefined settings can be selected or reset to the manufacturer default setting using the system settings (button "SYS" on radio with auto-pilot system).

The volume and sound settings are subdivided into the following partial functions:
^ Function sequence for manual volume/sound settings
^ Function sequence for speed-dependent volume control (SDV [GAL])

Function sequence for manual volume/sound settings
The manual volume/sound settings are subdivided into the following subfunctions:
^ Function sequence for volume settings using right multifunction steering wheel button group (S111)
^ Function sequence for volume setting on radio with auto-pilot system
^ Function sequence for sound settings using audio/COMAND control panel (A40/9)

Function sequence for volume settings using right multifunction steering wheel button group
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.
The control signals are forwarded to the radio with auto pilot system via the following route:
- Steering LIN (LIN E1)
- Steering column module control unit (N80)
- Chassis CAN (CAN E)
- Instrument cluster (A1)
- Interior CAN (CAN B)

After evaluating the control signals, the requested adjustment on vehicles with code (810) Sound system, are relayed with MOST to the sound system amplifier control unit and amplified by the latter. On vehicles without code (810) Sound system, the selected settings are processed and amplified internally.

The audio output via the speaker system is interrupted by actuating the mute button (S111s6).

Function sequence for volume settings on radio with autopilot system
Operating the rotary switch on the radio with the auto pilot system enables the volume to be raised or lowered for the desired audio function. By actuating the "Sound" button on the radio with autopilot system, the menu "Sound" is called and the user can set the corresponding sound via the audio/COMAND control panel. The control signals are processed inside the radio with auto-pilot system. The desired settings are relayed on vehicles with code (810) Sound system via MOST to the sound system amplifier control unit where they are amplified. On vehicles without code (810) Sound system, the selected settings are processed and amplified internally.

The audio output via the speaker system is interrupted by actuating the "MUTE" button on the radio with auto-pilot system

Function sequence for sound settings via audio/COMAND control panel
The user can set the corresponding sound by selecting the "Sound" menu on the audio/COMAND control panel.
The control signals from the audio/COMAND control panel are relayed via the telematics CAN (CAN A) to the radio with auto-pilot system. The desired settings are relayed on vehicles with code (810) Sound system via MOST to the sound system amplifier control unit where they are amplified.
On vehicles without code (810) Sound system, the selected settings are processed and amplified internally.

Function sequence for speed-dependent volume control
The volume is adapted to the noise level in the vehicle interior with the aid of the speed-dependent volume control defined by th vehicle speed. For this purpose the instrument cluster transmits information on the vehicle speed to the radio with audio-pilot system via the interior CAN.

According to this information, the radio with auto-pilot system increases or decreases the output level.
On vehicles with code (810) Sound system, the radio with auto-pilot system transmits the corresponding audio signals via MOST to the sound system amplifier control unit, which correspondingly actuates the speaker system.