Why did my radio stopped working?

What lights are not working ? The instrument cluster illumination is inoperative or all the lights ,radio , heater control head, all the switches that would be back lighted.

The climate control panel illumination is inoperative , The passenger door lock control switch illumination is inoperative. Could need new dimmer switch , new instrument cluster. When installing a new instrument cluster, it is necessary to upload the module configuration to the scan tool. Following installation of the new instrument cluster, download the module configuration from the scan tool into the new instrument cluster. Refer to Section 418-01 .

All lights, or just your illumination lights? Illumination: bulbs need replacing. All lights; SERIOUS problem. There is a dash panel fuse on car. check that. Has anyone done any work recently under dash( like installing a radio)? May be they accidentally pulled a connector loose behind dash. Need to pull your instrument cluster to check that. Usually two big connectors with lots of wires going to back of instrument cluster. If no power at all with key on: check under hood at power distribution center for a main big fuse out.

I have never seen one you couldn't change. You will probably have to take the instrument cluster and the radio out. Little bulbs plug in the back of the inst cluster. The radio might have a bulb down through the top or you might have to take the face off the radio to find it. I have changed both before.

I doubt any of the wires coming from the new radio would control your speedometer. A more probable cause is a broken wire going to the speedometer/instrument cluster or a loose plug at the back side of the cluster. Did you remove the instrument cluster to gain access to the radio? If so, is the plug seated securely into the back of the instrument cluster. It's very tight working behind the dash and easy to accidentally break a wire loose.

check the alternator charge level .
check the battery + and - are not lossing
if nothing then you have wiring short

if you have cluster and radio lights and it is just the heater area then the fuse is good they are all connected. sounds like it is in the heater control only. bulbs are probably burnt out.

Probably too late but I had the same problem yesterday. Try changing your battery. It sounds crazy but it worked for me.

1. Remove the dash around radio (just clips)
2. Remove 2 screws pointing up . (You do not need to remove screws which are parallel to the floor)
3. Remove screw pointing up on the bottom of the dashboard on left side of the driver (near left leg).
4. Remove 2 screws pointing up in the instrument cluster area.
5. Put car in 1st gear and gently remove black plastic surrounding instruments (it will have ait vents, so slide it carefully out not to damage foam insulation on air ducts; start on the bottom hear steering column) ; unplug connectors to clock and emergency flashers.
6. Remove 2 screws, now exposed, near instrument area, holding dashboard. (that was what I spent most time on, I didn't know about this screws.
7. Now gently remove (or move up) dashboard (around instrument cluster and heating controls.) Start next to ignition (careful not to damage the bulb next to the ignition.
Since you only need to get to the heating controls block, I only move up the dashboard next to it.
8. Remove 2 screws that hold the heating control and slide heating control out . This step is unnecessary If you totally removed the dashboard.
9. Pull out lever controls for fan speed, zone and temp
10. Use the screwdriver (flat) to pry 2 plastic tabs on top and on the bottom of heating control so black cover can be remover.
11. You did it! two bulbs are going to be under the cover.

Unfortunately you must remove the cluster to gain access to these bulbs. Remove radio, heater fan knobs, temp slider knobs,and temp control faceplate (carefully remove bulb in faceplate), then remove the Phillips screws inside the holes where these came out that hold the cluster . unscrew or unclip and remove the speedo cable from the back of the cluster. you may have to disconnect some electrical jacks (remember where and how they go back in!) to gain complete access. Then it's just a matter of pulling out the little bulbs and replacing them. Because this is so involved I would replace ALL of them at once. Hope this helps...;-)

I've done it many times myself. Here is what I do:

Remove the trim that covers instrument cluster, radio, heater control unit. To do this, you must remove 2 screws from trim that are mounted at top of instrument cluster area. Next remove screws above cigarette lighter/head light switch. Now that should be all of them. Position your steering wheel all the way down. Pull off of the trim from the radio area. It is snap fitted so just give it a little tug. The part of the trim covering the instrument cluster is really tight. You have to be careful and pry the thing out while trying not to scratch the top of your steering column. It does come out eventually. Now remove heater/ac control unit. Should be a couple of screws holding it in. There are vacuum hoses and a heater control cable mounted to the back of it also, but you shouldn't have to pull the thing all of the way out. Just turn the light socket to remove it from the back of the heater/ac unit and R/R the bulb.