The diagnostic connector is under the dash on the driver side.
The 1998 Toyota Corolla OBD 2 port is under driver side dash below hood release
The 2006 Toyota Corolla OBD 2 port is under dash at left, next to kick panel
Some states test cars for pollution compliance by connecting a reader to the vehicle's OBD-II port. Your 1990 Corolla is exempt from OBD-II testing because you don't have an OBD-II port - they first came out in 2006.
The 2001 Toyota Corolla uses a OBD 2 reader and it located on lower driver side of dash next to hood release
The 2001 Toyota Corolla OBD 2 port is on lower left side of dash
The 2004 Kia Sedona OBD 2 port is under dash below steering column
The 2004 Honda Civic OBD 2 port is behind kick panel; above accelerator pedal
Well, honey, in a 1992 Toyota Corolla, you can find the OBD port under the dashboard on the driver's side. It's usually located near the steering column for easy access. Just get down there and take a peek, and you'll find it in no time.
The 2004 Mitsubishi Lancer OBD 2 port is on lower right corner dash; next to console kick panel
The 2004 Hyundai Elantra OBD 2 port is on lower edge of dash between steering column & hood release
The 2004 Volkswagon Bettle OBD 2 port is on lower edge of dash at left side
The 2004 Ford Focus OBD 2 port is on lower left of hood release; behind unmarked pull-down door