Dashlights not working on 1999 honda civic ex

I have right now the same problem. I just pulled the fancy/shmancy radio head out of my (Honda) 1992 Acura Integra and the whole dash is now a mess. It had been professionally installed. The dome light now doesn't work, the "door open" warning lights stay on, the clock is messed up, etc.
I installed the fancy head in another car, in a 1992 Honda Civic. That works perfectly. Sounds like you need to find a professional installer to re-do your new head.
I think the dash lights and the taillights are on the same circuit/fuse.

GOOGLE radio code. you will need the serial number on the radio usually by removing it. or try www.car-radio-unlocking.co.uk usually a small fee.

The exact problem happened to me...

Opposed to a blown fuse, most likely the drained/dead battery caused the radio to "reset" itself. You should have a 5 digit (or 4) code that was provided by the dealer or owner. Most owners write it down somewhere on their owners manual. If not, the dealer can give you the code. Once the code is entered, you back in business!

Good luck!
Dennis W.

So, this is not a 2000 Hyundai Sonata? I used to own a 2000 Honda Civic and I believe those lights get power from a fuse inside the fuse/relay panel located on the driver's side under the dash. Check all your fuses. If all fuses are good, you've got a wiring problem - check for power & ground at each bulb. Obviously, if you don't have power to them, it's a power distribution/wiring issue. If you do have power to them but no ground, it's still a wiring issue.

Change the dimmer switc or have it bypassed

Good idea to rechk the hook ups.. The red and gray just may be critical, red usually is a hot wire and the gray the lights-good luck

fuse 16.... 7.5 amps ... fuse box under the dash

U will need to replace the ignition switch, this is not the key cylinder but the actual electrical switch the key cylinder operated. see photo. I noted that on your model Honda the switch comes with a new key cylinder, you can just use the switch and use your old cylinder over or install the new parts together.

Call the dealer but you will probably have to remove the radio and get the numbers from the back of the radio for the dealer

This code is not documented so the code reader is giving a false reading.
If the car runs OK and check engine light is not on, I would forget about it.