No. You can have one or more bulbs burned out and the rest would still work.
Headlight switch (IT) controls the dash lights ALSO.Some have a fuseable link..ASSUMEING all the bulbs are g00d..
The first check would be the fuse for the dash lights. If the dash lights are out too then it is likely to be the fuse.
check the fuse for dash lights
It could be the dimmer switch that will adjust the dash lights
either a fuse for dash or the light switch
The dash lights will not work on a 91 Honda Accord if the fuse or bulbs have blown. Inspecting and replacing the fuse is the first step to repairing this problem.
If your 92 Toyota Corolla taillights are out, but the dash light and fuse work fine, the bulbs could have burn out. Replace bulbs on each side.
Shoot yourself.
Usually a fuse. when the fuse blows the dash lights AND tail lights dont work. If your tail lights work and dash lights dont, check bulbs, if all blown at once you may have a shorting problem. If bulbs are good you may have a bad connection. Tracing wires is a big job. Get yourself a good quality test light.
If your parking and dash lights work- check the bulbs they are double filamented with the larger being for tailights
The light switch.
If tail lights and dash lights work - check bulbs