you need to power up the DME for reading ISN in this case.as it is mini cooper its better to read it on bench because taking out cas is not easy job for mini.yes there is limit for reading isn from same dme many times.On bench diagram is attached together for dme,it will be any of these 2 connect as per your dme model. MEV172.png You have insufficient rights to see the content. MVD1722.png You have insufficient rights to see the content.
If you got hardware4 for use white wire instead of yellow.