1) Get in and close all doors. Turn ignition on and off quickly and remove the key (all within about 5 seconds).
2) Within 30 seconds of turning the ignition off, hold down the "unlock" button and press the "lock" button three times. Release the "unlock" button.
3) Quickly put the key back in the ignition and turn it on/off again to finalise.
Range Rover Bluetooth Installation instructions