MB STAR INTERFACE PROBLEM

[vanos325i]

When I connected the MB STAR INTERFACE to the car, the engine control's fuse is destroyed. The computer can not be connected, and it is also happening. This only happens if the OBD connector connected. What's the problem with my interface?

/sorry for my bad english/

[mercis]

check your obd interface
7 to ground

[vanos325i]

4-5.pin /GND/ short-circuit is the 8. pin /ignition/. The cable is good. The interface of the faulty.