Engineering IV is marked by (2) on the map below. is the parking information booth, (3) is boelter hall, and the Yellow Box represents parking structure 9.
From parking structure, walk towards Engineering IV.
You should use the entrance on the south side of Engineering IV building. Go into an alleyway(1) that looks like (A) It is the alleyway sandwiched by Engineering IV and Parking Structure 9.
Look for the entrance that looks (B). This is the south entrance to Engineering IV. You are now in Engineering IV or on the map building 2.