The below image shows a Bose amp in a 2LT.
The connectors right to left are X1 (black), X2 (green), X3 (black), and X4 (brown). The X1 and X2 connectors are the same for all Bose installations.
X3 varies with installations in a 2SS getting additional wires.
In this photo X3 has only one wire (gray with green stripe, GY/GN) in pin 1 - Low speed GM LAN serial data.
X4 has 4 wires in pins 3-6:
3 WH/GN MOST serial data (-)
4 GY/VT MOST serial data (+)
5 WH/GN MOST serial data (-)
6 GY/VT MOST serial data (+)
pin 14 is WH/VT MOST control, and I believe it is hidden here. It is definitely present on the 2SS harness.
