I have an 03 Yukon Denali with the heat/AC and audio controls on the back of the front center console. All the controls work just fine and the LCD display is fine but the controls/buttons are not lighted at night. I assume that they are supposed to be.

Where do I begin to look for the problem of no lighting for the buttons? Is there a separate fuse for these lights? Broken wire? Are these lighted via fiber optics?

Give me a general direction to look if you can.

Thanks

Bob