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

GF82.60-P-2003CEB Volume/Tone Adjustments, Function
- with CODE (527) COMAND APS with single DVD drive (with navigation)
- with CODE (512) COMAND APS with DVD changer
- with CODE (528) COMAND with DVD changer
- except CODE (498) Japan version

Function requirements, general
^ C. 30g ON or C. 15R ON
^ Cockpit Management and Data System (COMAND) authorized and working correctly
^ Audio source in operation

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

Volume/tone adjustments, general
All volume and sound settings are performed using the COMAND controller unit (A40/3). This is performed either by the user or automatically by the COMAND control unit.

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 Aux (over media interface adapter cable (with code (518) Media Interface) or standard aux socket), selection "Standard" and "Boost" is possible under menu "Volume". The input level is increased by selecting "Boost".

On vehicles with code (810) Sound system, the COMAND control 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 are relayed from the COMAND control unit 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 COMAND control unit 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 transmitted 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 lines.

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 COMAND control unit).

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 via right multifunction steering wheel button group (S111)
^ Function sequence for volume settings via COMAND control unit
^ Function sequence for sound settings via audio/COMAND control panel (A40/9)

Function sequence for volume settings via 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 COMAND control unit over the following path:
- 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 via COMAND control unit
Operating the rotary switch on the COMAND control unit enables the volume to be raised or lowered for the desired audio function. By actuating the "Sound" button on the COMAND control unit, the menu "Sound" is called and the user can set the corresponding sound via the audio/COMAND control panel. The control signals are processed in the COMAND controller unit. The desired settings, on vehicles with code (810) Sound system, are relayed 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 COMAND control unit.

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 forwarded over the telematics CAN (CAN A) to the COMAND controller unit. The desired settings, on vehicles with code (810) Sound system, are relayed 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 COMAND control unit via the interior CAN.

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