depending on the vehicle, of course, most likely cause would be the combination switch
I had the switch assembly on the steering column get burned-up at it caused my headlights to go out. It cost about $250 to replace.
its to conserve power to start veh. with full voltage to starter headlights will come on after starting car
your headlights will burn out faster and could possibly blow a fuse, but you would go through headlights and a drastically increased rate if you use headlights when they are unneeded.
The taillights are supposed to go on when the headlights are activated.
Voltage surge? Bad relay? Bad switch? Bad ground?
Typically this happens when you turn the car off and the keys are still in the ignition.
use your parking brake this answer is in the owners manual
Often this type of behavior is caused by a bad ground for the lighting circuit. Check the ground circuit for the brake lights.
if both headlights went put it is probably a blown fuse
The Kia Sorrento instrument panel lights go on and off with the headlights. The headlights go on with an automatic daylight sensor.
go to a mechanic
If the dashboard dimmer switch works with the other dash lights, the fault is in the radio unit itself.