ISO metal contacts in pins 4, 5, 7, and 16. (15 may or may not be present)
The L9637 is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions.
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This interface converts the ISO signals for the Arduino inputs. It consists of a small IC (Freescale MCZ33290EF), a 510 ohms resistor, a DB9M that will be plugged with the cable mentioned above, and few wires that connect to the Arduino board.