My 1990 ls400 lamp failure sensor keeps blowing. I went through 3 already. Its the top bar above the connector. Will post pic.

 

The top bar blew on all 3 sensors

 

I put in a new sensor and my outertaillights will work but will blow in a few seconds. And that piece is burnt everything else woeks but outer taillights for daytime running but when brakes press outer lights and everything works fine.

 

did you check the outer tail sockets for a short...

 

Had a friend with a 94 camry a while back, some yabo put a single filament bulb in a dual filament socket. It also would burn up the lamp failure sensor.