The hands free telephone kit was already installed when I bought my X-Trail. The factory fitted radio does not automatically cut off when the phone rings. On further investigation I find that the yellow wire from the kit (-ve trigger) has never been connected. Can anyone advise as to where I connect this wire so the radio will cut out when the phone rings. I could fit a relay and wire the radio feed through this but I'm hoping there might be an easier solution. Hope you can help. The kit is a Cark 91.