Component description for the radio - GF82.60-P-3122CEB

MODEL 204.0 /2 with CODE (510) Audio 20 with CD changer as of model year 2009 up to model year 2012 /YoM 08, /model refinement package 11 

MODEL 204.0 with CODE (523) MB Audio 20 radio with CODE (494) USA version as of model year 2009 up to model year 2012 /YoM 08, /model refinement package 11 

MODEL 204.9 with CODE (523) MB Audio 20 radio with CODE (494) USA version 

MODEL 204.9 with CODE (510) Audio 20 with CD changer 

Shown on model 204.0 

Location 

The radio is located in the center console.

Task 

• Central operating unit for the entertainment and communication systems integrated into the vehicle 
• Reading in the controls and input signals 
• Evaluation of input factors 
• Actuates output media 

Central operating and display unit for the entertainment and communication systems integrated into the vehicle 

The radio provides the user with a structured and uniform interface.

• RADIO (FM, MW, SW, LW, AM, Weatherband (WB), Digital Audio Broadcasting (Digital Radio) (DAB) (with code (537) Digital radio and code (833) Great Britain version), satellite digital audio radio (satellite radio) (SDAR) (with code (536) SIRIUS satellite radio))
• DISK (CD/MP3/media interface (with code (518) Media interface)/AUX)
• Basic function for 6-disc CD changer (with code (510) Audio 20 including CD changer)
• TEL (telephone with telephone book function, SMS (with code (386) Mobile phone or with code (389) Mobile phone preinstallation with universal interface, USA/Canada), call lists)

The radio generates a structured and standard interface, which is then shown on the Audio/COMAND display.

Reading in the controls and input signals 

The input factors are read in via the following connections:

• Controller Area Network (data bus/CAN bus) (CAN) 
• Media Oriented System Transport (MOST) 
• Direct line 

Controller Area Network (data bus/CAN bus) (CAN) 

The radio is a subscriber of the interior CAN (CAN B) and the telematics CAN (CAN A).

Media Oriented System Transport (MOST) 

The radio receives control and audio signals from the following control units:

• Sound system amplifier control unit (N40/3), with code (810) Sound system
• Satellite digital audio radio (SDAR) control unit (N87/5), with code (536) SIRIUS satellite radio
• Digital Audio Broadcasting control unit (N87/3), with code (537) Digital radio and with code (833) Great Britain version
• Media interface control unit (N125/1), with code (518) Media interface

Direct line 

The radio is equipped with the following direct connections:

• Circuit 30g
• Circuit 31
• Wake-up for MOST (bidirectional)
• Telephone MUTE (with code (359) TELE AID emergency call system)
• FM, AM and CL [ZV] antenna amplifier (A2/18), for model 204.0
• Antenna amplifier for rear window FM antenna (A2/19)
• Rear window antenna amplifier 1 (A2/71), for model 204.2/9
• Bluetooth antenna (A2/91)
• Handsfree system microphone (A67b1)
• Electrical AUX connector (X39/45) (access in glove compartment, on model 204.9 as of 1.6.2011 in stowage compartment (telephone compartment) below center armrest), except code (518) Media interface
• External fan (diagnosis)

Evaluation of input factors 

The input values are processed in the radio.

Actuates output media 

The signals are transmitted via the following connections:

• CAN 
• Direct line 

D MOST 

CAN 

The radio is a subscriber of the interior CAN and the telematics CAN.

MOST 

Control and audio signals to following control units:

• Sound system amplifier control unit, with code (810) Sound system
• Satellite digital audio radio (SDAR) control unit, model 204.0/9, with code (536) SIRIUS satellite radio
• Digital Audio Broadcasting control unit, model 204.0/2, with code (537) Digital radio and with code (833) Great Britain version
• Media interface control unit with code (518) Media interface

Direct line 

• Audio OUT (speakers), except code (810) Sound system
• External fan (power supply, speed control and diagnosis)
• Switch voltage for the mobile phone cradle (A34/15) via the contact plate and the Bluetooth module (A34/7), with code (386) Mobile phone or with code (389) Mobile phone preinstallation with universal interface, USA/Canada
• Video OUT: Low Voltage Differential Signal (LVDS) line, transmits picture signals from the radio to the audio/ COMAND display via a copper line

Body 

Function 

The buttons for the operating panels on the radio are read in and made available to the integrated central computer. Button actuation is processed further in the central computer. If the "ON" button on the radio is pressed, the radio switches on. The volume is regulated for each audio source set by turning the ON button.

Pressing the function keys in the left button panel enables the user to switch to the desired system components.

CD drive or CD changer with integrated CD drive 

The integrated CD drive can be used to play audio CDs (including in MP3 format).

Technical data  Designation	Unit	Values	Tolerance range	Remarks
Radio (A2)
Power supply	VV	12		Battery voltage UB
Voltage limits	VV	9		Minimum UBmin
		16		Maximum UBmax
Power consumption	A	15		Rated power consumption IBmax
		5		Rated power consumption IModel
		approx. 4.5		Action, speaker IAction
		approx. 0.1		Action Cradle ON/OFF IAction
	μA	180		Quiescent current I0
Reverse polarity protection				Yes
Additional specific parameters				None
Special features				The radio is protected with a 10 A fuse in the MQS-40 connector at the rear panel.
Flash capability/coding capability				YES/n. A.

Wiring diagram for radio (RD) control unit

PE82.60-P-2101-97FAA