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The passenger airbag remaining "off" when a passenger is seated -- is a KNOWN issue with the Sonata (I'm still having some issues with it, even after the recall work done). The question is how HEAVY is that passenger.... If less than 100lb, it's normal, at least according to Hyundai's (unofficial, though) "lows".... If the passenger is 150 lb or more --- deffinitely a malfunctioning system there.
The rest of what you're describing seems like your car's computer is acting up. Have it checked by the dealer. BUT: if you had ANY mods involving wiring or electrical done to your car, you better "undo" them before approaching the dealer (or you might be refused service for "voiding the warranty"), or you might even realize the weirdness has gone... I had some electrical mods done to my car (using the Fog Lights as my DRL) and once the battery was replaced the car started doing some real weird stuff....
The rest of what you're describing seems like your car's computer is acting up. Have it checked by the dealer. BUT: if you had ANY mods involving wiring or electrical done to your car, you better "undo" them before approaching the dealer (or you might be refused service for "voiding the warranty"), or you might even realize the weirdness has gone... I had some electrical mods done to my car (using the Fog Lights as my DRL) and once the battery was replaced the car started doing some real weird stuff....
