It is very easy. if you have the key fob with the three buttons(top button opens doors, Roundel button locks doors, and third button opens hatch) then all you do is get in the vehicle and close all doors, place the key in the ignition, turn the key to start position (just before it turns over), turn kee back to off position and pull key out and hold down door open button while pressing the roundel button three times. the doors should lock and unlock. you are done.

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2004 X5 4.8is
Imola Red
20" M111 wheels
Black CF DiNoc Interior
M Sport Steering Wheel