Where do you find the bcm on a 2003 Hyundai tiburon

It likely requires programming to be "mated" to the new vehicle.

just check any fuse and wiring for headlights they might be some wire is lose connection.

More than likely that is your problem. It should be up under the dash on the drivers side somewhere but i could be wrong. here is a crappy pic of it.

Its the BCM. Follow these instructions for a cheaper fix.
DIY: BCM Turn Signal Fix - NewTiburon.com

Im sorry but Emissionwiz is wrong i had the same problem and i just took out the BCM board completely and dismantled it. I'll i had to do was desoder the relay switch and sodered in a new one the relay switch cost me 2.50. so now you dont have to replace the BCM. and questions email me at [email protected]

Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.

http://www.newtiburon.com/forums/showthread.php?t=102241&highlight=bcm

The tiburon turn signals are controlled by a bcm (body control module) The bcm controls the ground to the signals. These always go bad and cause the signal to stick on or just not work. hope i was a help.

I just found out today that it is a problem for alot of 2003 tiburons that the flasher relay for the turn signals will go out causing the turn signal lights to stay on even with the car off. The relays are internal and located on the circuit board of the BCM. In order to fix you will have to remove and disassemble the bcm circuit board from it's housing and resolder a new flasher relay. Haven't figured out where to get that flasher relay though.

The key icon is not the check engine light but the immobilizer light, therefore the car wont start. I have the same issue with my 03 Tiburon after i changed the motor and tranny. It ran fine for a couple of days and the quit.
I took towed the car to a dealership and they stated I needed a new BCM for $1200. However, I got a used BCM from an auto wrecker and will get the dealership to program it for about $200.