Component description for sound system amplifier - GF82.62-P-6003G

MODEL 463.346 up to 31.5.12 with CODE (EU9) Surround sound system (harman/kardon Logic 7) as of Model Year 2011 /YoM 10 

MODEL 463.236 /237 /270 /271 /341 up to 31.5.12 with CODE (EU9) Surround sound system (harman/kardon Logic 7) as of Model Year 2009 /YoM 08 

Location 

The sound system amplifier is located under the driver seat.

Depending on the equipment installed one of the following control units will be installed, hereafter referred to as the "audio unit":

• Radio (A2), (with code (EF5) MB Audio 20 CD radio, (NTG 2.5))
• COMAND operating, display and controller unit (A40/3) (with code (EU1) COMAND, APS)

Task 

The sound system amplifier is responsible for the following tasks:

• Receive signals 
• Decoding signals 
• Support and amplification of signals 
• Transmit signals 

Receive signals 

The input factors are read in via the following connections:

• Direct line 
• Media Oriented System Transport (MOST) 

Direct line 

The following signals are received via a direct line:

• Power supply via circuit 31 and circuit 30g via a direct line for each circuit
• Audio mute by telephone mute from external mute signal (e.g. telephone mute or emergency call system mute (with code (ZU8) USA version)) via a direct line
• Wake-up signal

MOST 

The amplifier for sound system is a subscriber of the MOST and receives the Digital Transmission Content Protection (DTCP) copy-protected audio signals from the following components, for example:

• Audio equipment
• High definition tuner control unit (N87/8) (with code (EU7) HD radio)
• Media interface control unit (N125/1) (with code (EH3) Media interface)
• TV tuner (analog/digital) (A90/1) (with code (EM8) TV tuner)

Decoding signals 

The following signals are decoded:

• DTCP-copy-protected audio signals based on the latest digital signal processing technology

In audio applications, digital signal processing means processing audio tracks using mathematical algorithms with the objective of improving the acoustic sound properties.

Support and amplification of signals 

The following signals are supported and amplified:

• Logic 7 supported
• Two stereo entertainment channels and three announcement channels (e.g. for voice output of navigation instructions) are supported
• Amplification of decoded audio signals

Transmit signals 

The following signals are transmitted via a direct line:

• Output of signal tones (BEEPs), digital multiple channel output and output of decoded, volume-adapted and amplified audio signals over the following speakers:
  • Left front door speaker (H4/1)
  • Right front door speaker (H4/2)
  • Left rear door speaker (H4/5)
  • Right rear door speaker (H4/6)
  • Left rear speaker (H4/7)
  • Right rear speaker (H4/8)
  • Center cockpit speaker (centerfill) (H4/27)
  • Subwoofer speaker (H4/29)
  • Left cockpit tweeter (H4/33)
  • Right cockpit tweeter (H4/34)
  • Left rear door tweeter (H4/37)
  • Right rear door tweeter (H4/38)

Function 

The sound system amplifier is activated via the audio equipment. The audio unit also provides all of the menus for user guidance. In addition, the following subfunctions are also available:

• Diagnosis 
• Software download 

Diagnosis 

The diagnosis of the sound system amplifier is performed using the Keyword 2000 protocol.

The sound system amplifier can be configured via "Common Vehicle Information".

Software download 

Updating is possible with the audio equipment drive using a CD or DVD.