WARNING: This page is about a different car, the 1997 Mercedes-Benz SL500 and 1997 Mercedes-Benz SL320. However, it is still accessible from the selected car via links, so may be relevant.
ACC push-button control unit consists of temperature control wheel or push buttons, mode selection push buttons, and fan control pushbuttons. See Fig 3 or Fig 4
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Fig 1: Identifying ACC Components (1 Of 2)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: Identifying ACC Components (2 Of 2)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying ACC Push-Button Control Unit (1997)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 4: Identifying ACC Push-Button Control Unit (1998)