Engine Electrical diagram for 2002-2003 Toyota corolla - PLS HELP!!!

Electrical diagram for 2002-2003 Toyota corolla - PLS HELP!!!

hey guys,

i own a late 2001 november toyota corolla.
recently the engine oil, the yellow tin can with the squigle little line underneath is popping up after 5-10mins of driving, once it goes on, it stays on.

now i have taken it to several mechanics, they have tested everything and saids its not a mechnical problem. theyve check the oil switch and changed it too. there is enough pressure goin through and all fuse are good.

i got it checked with an auto electrician and they said, it might be a lose wire or something from the main module going towards the dash.
but i will need an electrical diagram of the car in order for them to diagnose and hopefully fix.
Toyota dealers apparently are pretty reluctant to provide me with this diagram.
does anyone hav this that they can share with me or advise me on where to go to be able to download it.

many thanks guys!
aaron