1) operator error. check dimmer switch setting.
2) all bulbs faulty, check and replace as needed
3) bad (burned or corroded) headlight switch. expect taillights to be out, your question indicated this is not so
4) loose connection at electrical connector to helight switch. Try moving tilt column and wiggling connector
make sure your dimmer switch isn't turned all the way down. Then check the fuses next.
The fault is in the switch itself, quite common on this age of car, the dash lights and rear lights are worked off the same contacts on the back of the switch, replacement is the usual answer,
My dashpanel lights stopped working in your Chevy Monte Carlo ss 2001 what could the problem be
What year? All lights? Check your fuse box.
had that prblem, its your wireing hornis
Check fuses.
a bad fuse of a faulty switch.
You have got a blown fuse. These lights are all on the same circuit.
Make sure parking/tail lights are working - if not, may be a fuse If parking/tail are working - may be bulbs or switch
Bulbs may be burnt out.
in dash lights
If they both stopped working at the same time - check the fuse. Fuse # 20 in the underdash fuse panel.