My brake lights do not work tried replacing fuse ,bulbs, modular stil they dont work on my lexus 1990 ls400

Is the brake light switch hooked up. The wire can be broken near the switch and the switch can fail too. do the turn signals and 4 way flashers work? Course if you have yellow turns then that test doesn't prove anything, The grong to the tailights can fail it's near the trunk latch under the trim, Wire can be broken putting heavy objects in the truck. Does the high mount brake light work? The bulbs in them don't last long the harness to the lights in the trunk lid get in troble and fail too. The light out module has more than one power source and all three have to be good for the brake lights to work does the dash moniter turn on the warning light when you put the brake on with the key on? If it does and the lights don't work the three circuits are good but if the warning doesn't come on and the lights still don't work then your still looking for a blown fuse. even the cig. light fuse has to be good, Check all the fuses with a test light as some blown fuses can look good and be bad.

Then it's probably a ground wire that isen't atached