bad ignition switch - inside steering column
Check the Hazard warning switch
stuck chock
Most likely because the switch is stuck in one position. Find the switch and repair or replace.
the brake switch at the pedal is stuck or out of adjustment.
Conforming to national / state vehicle construction and use laws. If not, you've got a relay stuck
have your drl (day time running light mogule) checked...it can be unplugged, but then you may not have any lights at all on some vehicles.
most times if brake lights are stuck on you have a bad brake light switch on pedal under dash
the parking brake may be stuck and that causes the brakes to lock up completely, and the horn and lights will stick work if the parking brake is stuck.
your battery is dead
This happened to me. I accidently turned on the iconolism switch and it got stuck
Start by replacing the Flasher Relay.
The air doors maybe stuck. Or selector switch is not is not operating correctly.