The graphics above the headlamp switch do light up. I think you get at the bulb from behind the dash, but removing the knee bolster to do it is no small feat.

Removing the headlamp switch knob is done with a small (very small) flat blade screwdriver. Look up at the knob from below and you'll see a small slot. Press the blade of the screwdriver up into the slot while pulling on the knob and it will come off. However, this isn't going to get you access to the bulb you seek.

To remove the knee bolster, there's one screw accessible via the vent visible at the edge of the dash when you open the door. The grille is removable by hand and you'll see the bolt/screw in there. It faces vertically (attaches to the bottom of the dash).

There's another screw mounted horizontally behind the parking brake release handle - I think it's on the right-hand side. You should see it when you pull the handle out.

There are two more screws up underneath the bolster - they're near the vents.

There may also be one more screw on the firewall to the left of the accelerator pedal.

There are two latches that are found hidden between the bolster and the bottom edge of the dash. Take a small screwdriver and insert it horizontally between the carpet and the bottom edge of the dash and slide it towards the steering wheel. You'll find the latches about 6" to the left the steering wheel center line and more-or-less centered in the bolster on the right side next to the console. There's a little tab that is on the front of the latch - press inward on the carpet and I think you can see it - taking the small screwdriver and wedging gently on that tab should release the latch.

AllData says the latches are screws. They may be screws on some models, but on my '92, they were latches. AllData also says you "hold cover down for access" - there's a little give in all of this stuff - so don't be too afraid to pry or pull to peek and prod. Just be careful not to pry or pull too hard - and don't pry against anything soft.

Once you get the bolster out, you should be able to reach in behind the switch and find the bulb holder. I think it just snaps into the back of the graphics frame.

As for the hot/cold buttons on the center vent - they are also back-lit. To get the vent assembly out is nearly as complicated as the headlamp switch affair.

You must first remove the "upper" glove box (I call it a 'spectacle' box - it's where I keep my sunglasses - some cars have the cell phone control mounted there) - the one above the vent. To do that, you have to pull out the lock assembly for the glove/spectacle box. You need a master key to do this - one with a square head. Put the key in the slot and turn it about 45 degrees. Now take a small drill bit (about 1/16 or a little smaller - AllData says 1.5mm) and insert into the hole you should see in the escutcheon. You know the key is in the right place when you can insert the drill bit - it won't go if the key's not in the right spot. The drill needs to be large enough to be snug in the hole, but you should be able to insert it easily. Use the bottom of the bit (the part you insert into the drill) in the hole - wear gloves or tape over the helix of the bit to prevent cuts on your fingers. Press straight in and possibly wiggle the key/bit a little and the key cylinder should release and can be pulled straight out of the dash. The bit will need to go in about 1" or more. LEAVE THE KEY in the cylinder.

Inside the cylinder bore you should find a phillips screw at the bottom - loosen this screw and the lock assembly can be removed. Just pull it out of the way a bit.

There are 2 screws at the back of the spectacle box that hold it into the dash. Remove those as well. If you have a cell phone controller in the box, you'll have to get that out to gain access to the screws - I have no idea how to remove the control - my car doesn't have one.

Once you get the spectacle case out, there are a couple of screws visible and the vent assembly can be pulled out with ease. It is possible that you'll see the bulb housing when you remove the spectacle box - I'm not sure. If you do - no need to pull the vent assembly - just remove/replace the bulb.

When you reinsert the key, there's a tab on the lock cylinder where the long thin portion of the shaft meets the tumblers area - make sure that tab engages the recess in the lock assembly in the dash. You don't need the pin to reinsert the key - put it back in at the 45 degree angle you removed it at (that's why the tab is important - you can be 180 degrees off) and it will snap into place.

I'll bet money that the same bulb is used in both applications.

Good luck.