Hey All, '06 XLT w/6 disk, rear entertainment and sun roof. Pretty basic so no extra buttons on dash like adjustable pedals, etc. With the headlights on the HVAC control lights won't turn on until I turn on the rear defrost or turn the fan on. The vent selector dial is much darker than the temp and fan dials. They do work but it takes different ways to turn them on on different days. Any thoughts?