I have same problem have you figured it out yet?
the bulbs burned out
Check your tail lights to see if they are working. Some car makers tie the dash lights to the tail lights as a way to warn you the tail lights are out. Alternately, your head light control dimmer has gone bad.
Dash lights are soldered in place on the board. If they are all out you may have a fuse out or the instrument cluster is gone.
IF it is the all the dash board lights it is probably a fuse, else if it only one light the switch on the is probably gone that lights up that light. There are no dash bulbs a they are LEDS so the chances of them blowing is slim
The dash light dimmer control could be in the off position or broken.
maybe either a loose bulb or a burnt out onecheck your dimmer switch it may have gone bad
because the guy that sold it un plugged it to hide faults and black taped dash lights
check the fuses. These are usually located somewhere under the dash, Check your owners' manual if you cannot find them. I am assuming that all dash lights went out at the same time, so it is not likely that the bulbs all went bad. Many cars have have a rheostat that let s you dim or brighten all the dash lights -this may have gone bad. Finally there may be a short or bad connection in the line from the battery that lights the dash. To find this is not easy and will likely require expert help. You may want to do what I did for my 1976 Plymouth and tape a little flashlight to the steering column to light the dash.
Get magic eraser and rub on floor until gone. If you get permanent marker on granite, get nail polish remover and rub until gone. If you get permanent marker on your skin, get a magic eraser and rub.
other than you doing that your self from the dash, its probably your door switch that has gone bad, or the trunk
If the fuses are all good (which, I bet they are), you most likely have a faulty dimmer control. Almost all the dash and interior trim lights are wired through this switch to allow you to dim them. If it has gone bad, that could cause them all to stop working. Fairly inexpensive and easy to change. Check the fuses-- under the dash and/or under the hood.
it could be that your brake light switch under your dash that sits right on top of your brake pedal has gone out