Which lights will illuminate the LIGHTS warning light ? Replaced the bulbs in the third brake light and the LIGHTS is still coming on. All exterior lights look good. Maybe the tail light sensor.
Possibly a bad earth in the brake light loom? I'm not entire sure if that would make the light come on in these... I had a friend with an SV21 Camry that used to throw up a light warning when the brake lights all worked. Turned out to be a wiring thing.
I took out the black box in the boot cause the rh tail light wasn't going , pulled it apart and soldered the dry joints, it fixed the tail light issue but the light warning in the dash now comes on when I turn on the lights, I assume the solder job did not go well, all my lights work so I am not worried about the dash light , so it could be your black box in the boot..
Mine comes on the second I put my brakes on and I have one of my bulbs in the third brake light out. (My left turn signal blinks really fast when my lights are on because it is out as well). As long as you have checked your lights and they are all working, I don’t think it’s a big deal. I like it because it shows me the second the brake starts to engage, and it helps prevent you stepping on the gas when you mean to step on the brake haha.