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?