the quad-lock connector has numbers on it, these numbers are important. please check this photo below:

the NBT or NBT EVO system Quad-Lock connector diagram is here:

for the first sight it may look difficult to insert or remove pin with wire from the quad-lock connector, but when you know how to do its become very simple.

the BMW quad-lock connector is like a LEGO constructor, you can split this connector to many small connectors. and then remove or replace pin places.

as you see in this photo,  for this you only need small flat screwdriver.

press this lock with scree driver and pull out the plug from quad-lock connector

After you pull out this plug from main quad-lock connector

you need to remove shell from the connector, please look, there is a lock here.

you need to lift the lock "green arrows"  and pull wire to the side "red arrows"