I recently purchased the D3 to install it in my Toyota Matrix. I also bought the Metra harness. The D3 harness has an orange wire marked 'Ill' for illumination. The Metra harness has an orange/black wire marked as 'dimmer'. There is no illumination wire on the Metra harness. Am I to assume that the D3 illumination wire gets connected to the Metra dimmer wire?

No one knows whether the illumination an dimmer wire can be connected together?

Ok, I found out from Metra that Toyota does not have an illumination wire in their radio harness, only a dimmer. They said that I would have to find the parking light wire to connect to the illumination wire on the D3. Is using the illumination wire necessary?

Ok, I found out from Metra that Toyota does not have an illumination wire in their radio harness, only a dimmer. They said that I would have to find the parking light wire to connect to the illumination wire on the D3. Is using the illumination wire necessary?

as someone posted in my thread:

That wire changes the map from a white backgroung during the day to a black background at night. If it is not connected properly, it is like driving with a flashlight in your face at night.