OBDII Port
The OBDII port is a 16-pin connector found in the driver-side footwell (under the steering wheel).
In the Gen 1 Leaf, it directly exposes the AV-CAN, EV-CAN and CAR-CAN buses.[1]
In the Gen 2 Leaf, it instead connects to the CAN Gateway, meaning that passive monitoring of the buses is not possible via the OBDII port.
This port can be used with generic hardware such as an ELM327-based Bluetooth OBDII dongle to connect to apps such as LeafSpy, or it can connected to CONSULT-III plus (C-III Plus) via more specialised hardware.