When I turn on my headlights the dash board goes black. The dimmer switch is not the issue

My first suggestion is to check the dimmer on the dash. There should be a rotatable wheel on the dash. Make sure it is on fully.

Check to see if the dash lights work in the parking light setting. If they do there, but not with the headlights on, my bet would be the contacts/wiring in the switch itself.

he problem is the dimmer switch it self. This kinda problem happens a lot with nissan's

You probably already checked this but the simplest solution is the control used to turn on the interior lights and to dim your dash lights. It is a dimmer switch to the right of your headlight switch. If it is turned all the way down then you would have no dash lights and no headlight chime. Turned all the way up it turns on your interior lights. If this isn't your issue and if no fuses are blown then try to turn the dimmer switch all the way up with your headlights on. If the dash lights come on with the interior lights then your switch is fried and you may have a short in the interior light circuit.

The dimmer switch for the headlights only affect the headlights. The dimmer control for the dash lights only affect the dash lights.
So if the parking lights are going off too, I would say its the headlight switch. Thats about the only thing that involves all three circuits.
It could also be the harness plug at the headlight switch.
BTW - the turn signal lights are another circuit from the parking lights.

The power goes from the headlight switch thru the dimmer switch for the dash then to the cluster. You would check for voltage at those three points.

I wopuld suggest you replace the dimmer control switch for the dash lighting.

This is very common. the headlight switch is bad. replace the switch and that should solve the problem.

i have run into some that the dash lights dont work at all or they come on and off while driving.
the switch goes bad. there is also a dimmer switch . the dimmer switch controls the dim or brightness off the lights.

you dont know where the dimmer is? on the left, on the headlamp switch or a small knob.

If nothing is broken, check to see your dash light dimmer isn't turned all the way down. If you have automatic lights that turn on at dusk and you place something over the light sensor (usually on the dash board), the headlights will come on during the day and set the dash lights to the dimmer switch setting.

Check the dimmer switch to your dash light. If there turned down, your dash and radio illumination light will be dime or not working at all. Keep me posted, be glad to know if it is the dimmer switch turned down or you dimmer switch has gone bad. Good luck