Did you notice that the hood must be open.
Hood open or closed shouldn't matter as my other OBD scanners work with it open or closed. 
In any case, just to be thorough, I just tried it again with hood open and still no workie!
I also tried the  GS-911 in OBD mode  on my older farm truck (2003 era), that has no hood switch and it doesn't work on that vehicle either.
It just can't seem to read standard OBD data.