Hello Ramsy,
sorry, i think the exits on B17 don`t have numbers such as at the highways...
You have to take the exit "Klosterlechfeld".
It`s quite easy to find:
It`s at the end of that part of the B17 which lies at a lower level. Tere is an s-type curve and in the second bow of the s you have to leave the B17.
From there the runway lies eastward, so cross over the B 17 on the bridge, drive through the circle, and then you will find the runway lying left hand.
Regards,
Roman