Originally installed professionally about 3 years ago using a tele mutes cable and interface, all behind the dash, using the standard loom before it connects to the sat nav loom which then runs to the boot. (I fitted the sat nav earlier this year and all works OK by simply plugging the sat nav loom into the 17 pin BM connector. The car never had the ISO connectors so it was a simple job). I wonder if it is because I'm using bluetooth? An old hard wired phone and cradle seems to work better. Can the signal be routed through the amp in the boot, it's the standard Rover job, no aux inputs?
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