Hi @alicia_marie ,
Did you check that the right hand (RH) stop light bulb was OK, you didn’t say?
(click on image to enlarge for better viewing)
If the bulb is OK check if there is 12V DC voltage getting to the bulb socket connector when the brake pedal is depressed. Be aware that it is a twin filament bulb i.e. two lights in the one bulb - tail light and stop light, so if there is no voltage on one connector pin in the socket try the other one.
If there is voltage at the bulb connector, check that the earth connection for the bulb socket is OK but suspect that it is OK as you didn’t say that the RH tail light wasn’t working and they share the same earth connection. If the earth is OK check for corrosion in the bulb socket connector
If there is no voltage at the bulb connector, here’s a link to the 2004 Corolla wiring diagrams. Go to p.94-95 to find the wiring path for the Rear Combination Light RH which shows where the wires go from the brake pedal switch to the bulbs. Given that the LH and the High Mounted (centre) stop lights work OK you only have to focus on the RH wiring path.
With the dash lights, did you check that the instrument panel dimmer switch (example only) is turned fully on, you didn’t say?
if it is then is it only the combination meter lights (speedo etc) or do other lights such as the light for the cigarette lighter, rear window defogger switch, blower switch etc also not light up when the headlights are turned on?
Looking at p.227 in the wiring diagrams it may be a faulty instrument panel dimmer switch as the power for all the lights in the dashboard go through it. (shown as R7 Rheostat in the diagram). If only the combination meter then it still may be the dimmer but could also be the lights or the connection to the lights in the meter itself.
Hopefully this is of some help.
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