ok dimmer is ON the pull out switch, this combination turns it off somehow, not sure if this is operator error or not~ my toyota had a separate "dimmer" so in the country one might dim the dash lights, you do not always want them of blinding strength~ re-examine the way that you are using the dimmer~

There is a knob by your headlights switch that controls the lights on your dash turn it up or down to you desired position and brightness of dash lights if turned all the way up it’ll also turn on all lights inside the vehicle