So I had enough time to redo the test without the card. 

The results are the same...

I guess the card is dead then, or my tool is not good enough.

I've now had a closer look at the card, and it seems (I am probably wrong) that a capacitor has been replaced by a resistor and another capacitor (C22, bottom left corner) . It is not a neat job. My board is revision 3. Uni, can you check with yours?