The interior "back" illumination for the heater/ac/defroster section of the dash is out. This is the section of the dash that dips down below the radio. How do I access the bulb(s) that are involved? I am assuming that this is a bulb issue(?)
Before you assume too much, check all the fuses just to be sure. It may be a bulb issue, but if you dont have a manual with circuit diagrams, start by checking the easiest things first.
Does your rear defroster work, even though the indicator is not illuminated?
Yes it is a bulb issue. I had the same problem in my 2000 Camry LE. Its actually quite easy. First, take off (very gently) the selection knobs (fan speed, temp, air source). That is probably your hardest step. Then, behind the knobs are small screws. Remove them. Then take the bezel off that fits around the climate control unit/stereo which holds the cigarette lighter and ash tray. Finally, unclip the face of the unit off of the base.
Once open. There are two tiny bulbs inside covered covered with a green light diffuser. remove the bulbs by pulling straight out and remove the covers. Reverse the steps with new bulbs.
I did this a few years ago...so I can't remember exactly but I think those are all the steps. Hope this helps!