How to turn off high beam lights - 2004 Chevrolet Monte Carlo

It could be driving lights mode instead of low beam. Check connections.

It is normal that when you select high beam that the two high beam lights come on and the low beams switch off. the light position should show high beam
It goes off on low beam when the high beam lights go off and the low beams light up
If the light is reversed then check the wiring to the light
You didn't mention what car it is but if it has a light module then the problem may be in it.

some cars has a light interior adjuster and when turning all the way leave the interior light on all the time check that out should be around your light switch

the light is out replace it the low side work when u have high beams on ththe short in the light is in the low beam .

Common problem, there is a headlight relay in the power distribution center under the hood that needs changed out.

just replace the dimmer switch under the column its wore out on the low beam side

DID YOU CHECK THE BULBS?

Pull your lever back if the high beams work that way you need a new high/low beam switch, if they do not you need to replace headlight bulbs.

First place to start is with headlight switch. I did have a case many years ago when both high beams were blown out at once, but this is rare. When you have the headlight switch out, jump power from te low beams to the high beam contacts. If high beams come on, replace switch.
Bill