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

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

Function requirements
^ Status "Circuit 30 ON" or "Circuit 15R ON"
^ The auto pilot system (APS) is authorized and operating free of faults
^ Audio source in operation

General
All volume and tone settings are made using the radio and navigation unit (A2/56). This is performed either by the user or automatically by the speed-dependent volume control (SDV [GAL]).

The volume and sound setting function can be conducted as follows:
^ Function sequence for general volume setting and general, extended tone settings via left multifunction steering wheel button group (S110) or right multifunction steering wheel button group (S111)
^ Function sequence for general volume setting using the rotary switch of the radio and navigation unit
^ Function sequence for general volume setting and general, extended tone settings via control buttons of radio and navigation unit
^ Function sequence for speed-dependent volume control

The radio and navigation unit comes not only with the general tone settings such as bass, treble, balance and fader, it also is equipped with extended tone settings. These are:
- Ambiance, with code (810) Sound system
- Surround, with code (810) Sound system

Operating instructions
The volume can be set as follows:
- Using the buttons + and - for setting specific functions and volume control (S111s1) on the multifunction steering wheel (MFL)
- Using the rotary switch of the radio and navigation unit

The tone can be set as follows:
- Using the rotary switch and control buttons on the radio and navigation unit

Function sequence for general volume adjustment on multifunction steering wheel button groups
By pressing the + and - button, for setting specific functions and volume control, the volume for the desired audio function is increased or decreased.
The control signals are forwarded via the following path to the radio and navigation unit:
- Steering LIN
- Steering column tube module (N80)
- Interior CAN

Function sequence for general volume setting using the rotary switch of the radio and navigation unit
The rotary switch of the radio and navigation unit can be used to set the volume. The signal path is then an internal one.

Function sequence for general, extra tone settings using the control buttons of the radio and navigation unit
The rotary actuator of the radio and navigation unit can be used to manually set the tone (bass, treble, balance, fader as well as tone options) for each audio source. The required tone settings can be performed via the "Sound" menu. They can be set separately for each function (e.g. CD, radio reception, traffic announcements). The control signals are read in and evaluated within the radio and navigation unit. The desired settings in vehicles with code (810) Sound system are transmitted to the amplifier for sound system (N40/3) via the MOST. Vehicles with code (810) Sound system are also equipped with the following tone options:
- Ambiance
- Surround

If the tone emphasis is changed (balance, fader) the volume relationship between the individual speakers changes relative to each other.

The volume and tone settings are shown on the display of the radio and navigation unit. The volume setting can be carried out separately for each audio source. Predefined settings can be selected and reset to the manufacturer default setting via the system settings.

On vehicles except code (810) Sound system, the selected settings are processed internally and the audio signals are amplified based on the settings and output at the speaker system via a direct line.

Function sequence for speed-dependent volume control
The speed-dependent volume control can be used to adapt the volume to the noise level in the vehicle interior. In this case, the vehicle 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 and navigation unit raises or lowers the output level of the audio signals.

The vehicle speed signal is forwarded to the radio and navigation unit via the following path:
- Instrument cluster (A1)
- Interior CAN