It is probably because the sensor under the seat for the seat belt has disconnected
--Same thing happened to me. The light would go out when I pulled on the seatbelt. The reason was the simple fact that the belt was twisted before it came out of the shoulder "bracket". Oh... The sensor is in the door post, not under the seat. I also thought of that eventuality and checked. Nope, no sensor under the seat!
Underneath the steering column
The check engine light on a Toyota Tercel can come on for a variety of reasons. It can be come on whenever there is a problem with the engine that needs attention. To reset it, disconnect the battery for a few minutes then re-connect it.
you must remove the grill and the bezel that surrounds the light.
Check engine lights will not turn off in a vehicle until they are reset. To reset the light on a 1994 Toyota Tercel pull the ECU fuse.
Light housing twists from inside of trunk for access of bulbs.Toyo joe
Toyato never made Tercels. :P But the Toyota Tercel's brake light switch is located ON the brake pedal just above the viewable area.
The brake light switch is broken or out of adjustment.
go to your owners manuel, there is a section in there that will tell you or call your local dealer
It's on the brake pedal just above the viewable area.
More than likely, the stop pad has fallen or broken off.