1996 Toyota Camry Light indidcator

on the front dash, where the MPG and check light indicatiors are located in the far left had side there is an indicatior light the will not go off. It appears that the light is trying to tell me something about the back lights, because a car is there with the lights showing on for the back lights. Whether the lights are on/off the indidcator light still stays on. I checked the lights with the lights being on and all the lights are functining properly. Please help!