Hi mate...hope this will help you:
1. hold the button (not on the wheel. on the pairing button which supplied with set with BT kit) ) for more time, for example 8 sec on "Off" position and 10 sec "On" in key position 1.
2. The CODE request should appear on the mobile phone, and this CODE you can find as a sticker on module.

Let me know results...

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Davud X5/110 - PITBULLET
Options: X5 4.4i, 07/2000
Modifications: 16:9/DVD Player “Absolute”/Style 177/BT Kit & Nokia Cradle for 6310i/Wheel Arch Moldings/4.6i Spoilers on Front & Rear bumps/35% Tint on Rear/Predator Angel Eyes/Full Black Grill/Xenon light on Low Beam/Facelift Tail lights/X-Pipe + MG-RACE Cat Replace/Green Filter/ Bosch Super4 Spark Plugs /Chrome Dash Rings/ Individual Black Carbon Roundels/Jlevis Silver Carbon Fiber Pedals.