There are several things that can cause it. One of the door switches may be misadjusted, the headlight switch adjusted so the interior lights come on or a malfuncton in the headlight switch. You just have to check it out. those things check out fine. is there a module that could be the problem?
in the fuse box
1,3,4,2
On the '92 sunblrd SE the power for the lights to from fuse to headlight switch to dimmer switch to bulb, no relay involved.
bad combination light switch
It is in the fuel tank.
The running lights have a bad ground.
Blown fuse, bad temp sensor, bad ground, bad fan motor
under radiator cap
.035 inch
Chevy Cavalier or Olds Calais...
burnt out lightbulb!
you have two buttons under the head light switch one will do the job if broke use tooth pick