How to Check VXDIAG Benz/ MB SD C4 DOIP by Multimeter?

Here we are going to check VXDIAG Benz/ MB SD C4 DOIP protocol using a multimeter.

Connection:

MB SD C4>>OBD connector>> GODIAG GT100>>Multimeter

MB SD C4>>Ethernet cable>>Ethernet adapter>>PC

SD C4 connect power supply to fourth minus and to eighth pin to IP power supply 12V of multimeter

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Test Method:

Turn on "enable Ethernet".

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Then 6v should appear on multimeter.

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If it still has no 6.5v on eighth leg, it means the old type of C4 PCB board.

Find a diode.

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We need to put supplement 54 with a letter and solder diode.

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After changing components,

Click "DOIP ON", then multimeter should display 12v;

Turn DOIP OFF, then multimeter should display no value.

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Go to Mercedes center folder.

Turn on "enable Ethernet", multimeter stays at 6.5v.

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