I'm going to install a Trailer module (TRM) into a Volvo V70 2005. There are are two sockets on it (a gray and a green one). I found the cable from the Rear electrical module (REM) which should be connected to the gray socket on the TRM. But I also found two cables with similar green connectors. I think the one with 5 wires should go into the green socket of the TRM, but where should the other go?