The locks on the 2007 Sonata shouldn't lock unless such an input is
received (or, if programmed, the vehicle reaches a preset speed).
This will be a difficult problem to find, given the intermittent nature.
This doesn't of course mean you shouldn't take it to be looked at, but
unless the dealer can reproduce the condition, the'll pretty much be
limited to anything Hyundai can tell them about similar problems
nationwide. It's possible they may pull the interior door panels to
investigate for pinched wires and such, but I'd doubt they'd get into too
much disassembly unless they had significant reason to believe they were
going to find something.
Comparing the 2007 to a 2003 will yield little of any value. There's
virtually nothing that's the same on either car. Also consider that it's
unlikely all of any particular car's design features will be exactly as
you'd prefer. The best you can hope for is to have the manufacutrer act
because you've made your opinion known to them. And believe me, they do
listen to these things.
Also, once the door is shut, the locks will again lock with the key in the
ignition. At this point, the car assumes you're inside. For now, the best
advice I can offer is to not leave the keys in the car. Furthermore, if
the vehicle believes the key to be in the ignition, the remote won't work,
so taking the remote with you isn't likely to be the solution, either.
I agree there's something wrong with the car, and that you have a right to
have it fixed. Unfortunately, finding the fix is likely to be costly to
you in terms of time and inconvenience.
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