I'm just in the process of fitting the two sockets for towing. I bought the full CAN-bus driven N socket and its S socket partner, as recommended on Towsure's web site.
Everything is going fine with the N socket, but I was a little surprised to find the recommended S socket was nothing more than a standard S socket kit with old style relay switched contacts - requiring connection to the ignition light to trigger the relays to close. WHAT?
Where on a modern car such as this do you connect it to?
I feel a bit cheated having paid £38 for the S socket which I thought was specific to the car, to find it was nothing of the sort and gave no clue how to connect this essential wire. The S socket even lacked the reversing light feed wire and I had to botch the extra wire into the loom.