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Removing and installing radio - ra820a1407502x(7502)

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Model 140 - A. Single-module unit, two-component pushbutton control module, radio/navigation system pushbutton unit (APS) 

A. Single-module unit, two-component pushbutton control module, radio/ navigation system pushbutton unit (APS) 

Fig 1: Identifying Radio Unit
G05440617Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Quiescent current retention unit disconnect, connect.
Ground lead on battery disconnect, connect.
Removal keys (1) insert, remove.
Radio (A2), radio control module (A2/4) or radio/ navigation system pushbutton unit (A2/29) pull out, slide in.
NOTE: Push retaining springs back on removed radio and pull out removal keys (1).
Electrical connections disconnect, reconnect.
NOTE: Vehicles with automatic pilot system
  • After reconnecting the battery the language is automatically reloaded (approx. 15 min.). The radio and navigation control module must remain switched on until the message "Language loaded" appears on the display.
  • After replacing the radio and navigation control module (APS) the following settings must be made:
    1. Activate selection menu by pressing RDS key and key 5 simultaneously and then switch on radio.
    2. Select loudspeaker system with cursor key and confirm with enter key.
NOTE: The two retaining springs on the side of the radio engage in the cut-out on the center console.
Fig 2: Identifying Retaining Springs On Radio
G05440618Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The removal keys are obtainable as replacement parts.

Fig 3: Identifying Cut-Out In Center Console
G05440619Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
REMOVAL TOOL

Designation Part no.
Removal keys (1 set = 2 each) 000 833 03 61
Commercially available tester   
Quiescent current retention unit e.g. Hans Zeheter CMP 12.2
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