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Audio mode, function - GF82.85-P-2030LEJ

MODEL 216 with CODE (529) HIGH Class Japan as of model year 09/YoM 08 MODEL 221 with CODE (529) HIGH Class Japan as of model year 09/YoM 08 

Function requirements 

General 

The audio mode consists of the following component functions:

Operating instructions 

Audio functions can be selected, activated and adjusted with the following components:

Radio mode function sequence (AM/FM) 

The antenna structures in the rear window receive high frequency (HF) signals for the FM and AM (MW) radio frequency bands. The following useful signals relevant for the radio reception are modulated onto these HF signals:

These HF signals are routed to the rear window antenna amplifier module (A2/12) via direct lines. This amplifier filters the frequencies of the radio frequency bands out of the received HF signals and amplifies them. The amplified signals are then sent via coaxial cable (FM, AM) to the audio tuner control unit (N93/1), where they are demodulated. The interface for user guidance is generated by the COMAND controller unit and shown on the COMAND display (A40/8).

The demodulated audio signals also undergo final amplification in the audio tuner control unit. In model 221, the audio is then output on the following speakers via direct lines:

In model 216, the audio is output on the following speakers via direct lines:

The function sequence for the radio mode also includes the following subfunctions:

AM tuner function 

In this radio frequency band, the wanted signals are broadcast by means of amplitude modulation (AM). These signals are demodulated by the AM tuner integrated into the audio tuner control unit. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible).

FM tuner function with phase diversity 

In this radio frequency band, the useful signals are broadcast using frequency modulation (FM). These signals are demodulated by the FM tuner integrated into the audio tuner control unit. In other words, they also separate the useful signals (audible frequencies) from the carrier signal (inaudible). Reception-dependent switchover between the antenna amplifiers is also carried out by the audio tuner control unit. This function runs automatically.

Function sequence, disk and MP3 

A 6-disk DVD player is integrated in the COMAND controller unit.

This DVD player can play the following media and formats:

The user guidance for controlling the DVD functionality (e.g. track selection) and for displaying supplemental information (e.g. track) is provided via the COMAND display.

Music Register function sequence 

The "Music register" function allows files from an audio CD to be stored on the hard disk in the COMAND controller unit. The stored music files can be called up as desired.

REFER TO SYSTEM WIRING DIAGRAMS Electrical function diagram for audio mode, function Model 216 PE82.60-P-2058-97CAB
Model 221 PE82.60-P-2058-97SAB
  COMAND controller unit, component description A40/3 GF82.85-P-3136LEJ 
  COMAND display, component description A40/8 GF54.30-P-6110LE
  Front central operating unit, component description A40/9 GF54.21-P-4500LE
  Audio tuner control unit, component description N93/1
Model 221
Except code (810) Sound system		 GF82.62-P-3132LE
N93/1
with CODE (810) Sound system		 GF82.62-P-3132LES
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