I have (2) older Panasonic HUs that I installed years ago. IN each case, when I am driving down the road but not listening to music (HU off), the HU still has some illumination (power button and clock). This seems to me to be pretty basic so at night you can see the power button to turn on the radio. I recently installed a JVC Arsenal A735-BT in my daughters 2005 Accord. Wired up correctly using Metra wiring harness. Everything worked fine but with the engine running but system off I had no illumination. Called JVC and they said this was correct. I found it hard to believe but I called Crutchfield and told them I did not want my dauhghter fumbling to turn on the system at night. They assured me that Kenwood would have illumination even with the system off so I ordered a Excelon X596. INstalled it today (correctly wired again using Metra harness) and of course there is no illumination unless you turn the system on. Is this just the way it is now or is this a "feature" found on only certain brands? The only other possibility is an issue with the Metra harness and a 2005 Accord. Any body have any ideas? Please do not respond asking me if I wired it correctly as I am sure it is.