VVDI Key Tool Plus Device Shows no Voltage Solution

 Problem:

I want to program the elv with xhorse vvdi key tool plus on bench. I have supply outside Power to MB fast adapter. I still get no power. No voltage displayed.  Programmed 3 mercedes keys until now
But cannot do ELV.

Photo attached:

Here is the possible solution.

Remove adapter and connect OBD cable, do a Kline self-test.

Go to immo programming——More functions——Device test——K-line test

If there is voltage without adapter, key tool plus device is no problem. Connect Benz adapter as follows, if there is no voltage, the Benz adapter is broken. Replace new adapter and try again.

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