If you have the amplifier or active noise canceling module mounted next to the parking brake, remove it. The full wire bundle for the BCM connectors is attached to the center of the BCM with a zip tie push pin. Pry that out so you have more slack to work the connector. It’s the top left connector (black) you are inserting the wire into, but just unplug all of the connectors from the BCM for more slack. To release the ones with the lever locks, put your index finger above the lever to push in the release tab while prying up with your thumb on the bottom of the lever. Slide the black curved wire hood off of the connector. If there is a wire in pin 11 already, just remove it and install the new wire.