My dads 2009 Hyundai Elantra was working perfectly and decided to change some LEDs that where loosing brightness, after we complete to identify the LEDs that where faulty, Interior and Exterior lights flashing on Alarm set, where not working.
My guess is some relay must have shorted, but not a pro so im here for help.

 

There are several types of LEDs and some require special things to be done so they work correctly.

If you want to get to the bottom of the problem, I would suggest you purchase the lamps you need from a Hyundai dealer. You may need to supply your VIN so you get the correct lamps.

 

Finally got to the bottom of the problem, Default Alarm System (which can be found below steering wheel, attached to the left) on Elantra have 3 separate fuses and one of them was faulty, replaced and now fully working.

And about LED i could not find them online was thinking on buying the LED chip and solder them. but i will ask first to the local dealership.

 

Thank you for the update.