Uninstalled factory radio and installed new radio. Now Dimmer light for car does not work...?

The car is a 97 Toyota Corolla

There is a white/green wire and a green wire not connected to anything behind the radio. The radio does not need a dimmer or illumination power. I believe these two wires deal with the dimmer or illumination. With the headlights on, 12 volts will show at these two wires. They look like they go to the dimmer switch. However, when you adjust the dimmer there is no voltage change and no lights come on that should (like the dashboard back light and such.) All other lights work (turn signals on dash, headlights, brake lights, etc).



Checked the fuses and all of them seem to be fine.

Not sure what steps to take now. Shouldnt the voltage for the white/green wire change when adjusting the dimmer knob? It doesnt. Help. It sucks driving at night with no dash lights. I have to go by how fast others are going to determine my speed.

Is there a way to test the dimmer switch itself, though I dont know why that wouldve stopped working.



Id appreciate any helpUninstalled factory radio and installed new radio. Now Dimmer light for car does not work...?First thing's first...check all the wiring and make sure that none of the wires are frayed or have any exposed strands that could possibly %26quot;ground out%26quot; to your metal sub-dash and pop fuses. Next...check all your fuses with a multimeter and not by eye. make sure that any unused wires are either terminated with a connector or taped off at their ends so they don't %26quot;ground out%26quot;. If none of these bear any fruit...you could've possible fried your dimmer switch and it needs replacement. You can usually tell if the dimmer switch is fried by smelling it...and if it smells kinda funky...it's probably shot. But before you spend money on replacing it (and it possibly not helping)...check everything else first!