Yup I think it's the right diagram.
In the code it says :
#define DIPin 4 // register select RS
#define DB4Pin 7
#define DB5Pin 8
#define DB6Pin 12
#define DB7Pin 13
#define ContrastPin 6
#define EnablePin 5
#define BrightnessPin 9
it seems ok to me
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2013 Hyundai Sonata Hybrid
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