attempted translation... "there is 3 plugs left there where the arrow is pointing.. what is supposed to be there as i am considering buying a car with this part missing."
yes...it's the translation of my chinese name......
just bought that celica today.......and will go back hong kong and get some cheap parts for it...(parts here is so so expensive)....
in Toyotas you will find many plugs that aren't plugged in to things. They try to use as many common parts as possible to reduce costs, so there will often be plugs for options/features that your car didn't come with, but others did.
Since it's in that corner i'd suggest it may be ABS related.