They are numbered in order from top left to bottom right.
2. The pin number of the plug part of the connector.
They are numbered in order from top right to bottom left.
3. The difference between the socket and plug parts of the connector. The socket and plug parts of the connector differ in the shape of their terminals.
a) All connectors are shown from the open end with the connector lock at the top.
The text is quoted from the source website: ToyotaMAN.ru
b) When disconnecting the connector, apply force directly to the connector body, and not to the wires.