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Audio/COMAND control panel, component description - GF54.21-P-4501CE

MODEL 204.0/2 as of model year 2009 

/YoM 08 

MODEL 204.3/9 

Shown on model 204.0 

Fig 1: Locating Audio/Comand Control Panel
G07531161Courtesy of MERCEDES-BENZ USA

Location 

The Audio/COMAND control panel is located on the center console between the front seats.

Task 

The Audio/COMAND control panel performs the following:

Operating unit for the entertainment and communication systems integrated into the vehicle 

The audio equipment provides the user with a structured and standard interface for the following system components, which can be operated using the Audio/COMAND control panel:

Read in input signals 

The input factors are read in via the following connections:

Direct line 

The Audio/COMAND control panel contains the following direct connections:

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

The Audio/COMAND control panel is a subscriber of the telematics CAN (CAN A).

Actuation of system components 

The Audio/COMAND control panel can be used to actuate the audio equipment functions.

Function 

Fig 2: Audio/Comand Control Panel Schematic
G07531162Courtesy of MERCEDES-BENZ USA

Schematic view of operating functions 

IMPORTANT The buttons are designed as push/push buttons.

In detail the following operations are possible with the audio/COMAND control panel (A40/9s11) on the audio/COMAND controller:

IMPORTANT On vehicles with code (527) COMAND APS with single DVD drive (with navigation) or with code (512) COMAND APS incl. DVD changer, the following sliding movements of the audio/COMAND controller can be used for the map view during navigation:

IMPORTANT On vehicles with code (523) Radio MB Audio 20, with code (510) Audio 20 including CD changer, with code (525) Radio MB Audio 50 APS, with code (511) Audio 50 APS incl. DVD changer or with code (528) COMAND incl. DVD changer, these sliding movements of the audio/COMAND controller are not processed.

Technical data 
Designation
Unit Values Tolerance range Remarks
Audio/COMAND control panel         
Power supply VV 12 to 15   Battery voltage UB
Voltage limits VV 9   Minimum UBmin
  VV 16   Maximum UBmax
Power consumption A n/A.   Standby (IB )
  mA 70   Action (IAction )
  mA < 0, 1   Quiescent current I0
Reverse polarity protection       Yes
Additional specific parameters       None
Special features       None
Flash capability/coding capability       YES/n. A.
REFER TO SYSTEM WIRING DIAGRAMS Wiring diagram, front central operating unit   PE82.00-P-2060-97FAA