This is for those with MB Star Diagnosis SD connect C4 multiplexer. Obd2tool.com will explain a lot about LED display with message, buttons, icons on the diagnostic system.

Display, buttons and icons:
The display is divided into two. In the upper area, permanent icons are shown (see following figure).
In the lower area, details are shown during the call up of information, setting of device parameters and during the diagnosis.

LED and acoustic signals
In the following table all LEDs and acoustic signals are shown together with their meaning:

Information in the display
Information buttons

Function keys

SDconnect C4 operating condition

Connection status

MB SD C4 images:

Wireless wifi connection

Wired connection

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