Hopefully someone can help. I have a 2013 xf sport. The sound system is ok but I thought it should have a bit more base. So I went to the boot to have a look at the subwoofer and there wasn’t on there to my surprise. All of the electrics are there and the connector. So I thought it would buy a Jaguar subwoofer that sits in the spare wheel well , so I plugged in in and nothing. My thought is as there was never one fitted the other end of the wiring loom is not connected to the head unit. I really don’t want to take out the head unit only to find out that it’s not that.
Many ideas suggestions will be most welcome.

Steve