99 Chevy Venture dash board lights and tail lights

Not totally positive but I believe on your Toyota there are two places that fuses are located. You stated that all fuses under the bonnet are fine and I assume that means under the hood. The other place to check for a blown fuse would be under the dash instrument panel usually located directly above where your left knee would be while sitting in the drivers seat. Hope this is of some help. Good. Luck.

The tail light assembly on this vehicle is a poor fit and moisture softer invades the bulb assembly when it rains. Remove the tail light assembly and replace any bulbs that have shorted out. You may need to replace the assembly.

I would start with checking the headlight bulbs (slim to none possibility but starting point) next go to the headlight switch.

Defective relays. Or break in wires some where,

did you replace the dimmer switch on the dash by the headlight switch

It sounds like a bad connection on the rear wire harness. Check all your connections working forwards from the rear light system.

I had this same problem i cleaned contacts that the bulb goes in and put dialectic greese on them.Also one bulb I think on passenger side brake light.one element shorted.Replace bulb and you should be all set.Dont ask me why.Must be bad design.

i went to a web site that helped me without charging me, that is how i fixed my car.

First you need to check all fuses. power in and out of fuse if all good it maybe a swicth or relay grounds etc

WHAT YOU MIGHT CHECK IS THE FUSE FOR TAILLIGHTS, OR DASH LIGHTS. THEY WORK OFF THE SAME FUSE. IF THE FUSE IS BLOWN THE HEADLIGHTS WORK BUT NO TAIL OR DASH LIGHTS