One problem related to headlight switch has been reported for the 2006 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Hyundai Sonata based on all problems reported for the 2006 Sonata.
Takata recall - in September 2014 my battery were going dead. Changed battery and it went dead also. After the 4th time for the battery to go dead, noticed the sided beams were on. When I had the lights in the auto position, when going underneath a bridge, the lights will comes on and goes off accordingly to the light outside. When daylight, you will not know known if your lights are on or off. So this was problem was the cause for my battery to go dead. Started noticing at night when turning off vehicle after using headlights, the side beams will not cut off until after trying 15 to 20 minutes of trying to turning it off. Took vehicle to dealer, at first they thought it were the switch. After one hour of waiting, found out it was not the switch and they had put the old switch back. Stated that it was the junction box needed to be replace.