From memory (it's a bit dark to go outside for a look) but in my i30 Diesel the place where they plug their diagnostic machine in is on the passengers side of the engine bay in the far right back corner (looking at the engine bay from the front of the car) I hadn't noticed it until it was pointed out by a mechanic friend.
Are you pleased with your car. What colour did you get. Mine is a manual SLX diesel (we love it). Hoping to start up an i30 owners club soon!
Why do we press harder on a remote control when we know the batteries are getting weaker?