Only my left side lights flash with Keyless entry on a 2004 Hyundai Sonata?

Question

All of my lights used to flash, but recently, only the turn signals flash in the front and back. Otherwise, all of the lights work regularly on my car (ie all turn signals work when driving)

Answer 1

Unless you are past 60,000 miles, and the car hasn't been in an accident, it should be covered under the warranty.  Sometimes it is simply a reprogram of the transmitter or alarm module.  Either way it is an electrical problem and can rarely be diagnosed without seeing the vehicle.  You know 'needle in a haystack'?  Well, electrical is like finding a needle in a needle stack :-)

Unfortunately, you probably have the DEI alarm system.  Hyundai discontinued this line because of problems such as yours.  

Worse case scenario would be replacement of the module - between $200.00 and $400.00 depending on what else it controls.