Press and hold down AS and the On off switch at the same time with the key in ignition. you should see something like 
10 ---- come up after awhile. enter the 4 digit number by pressing either 1, 2, 3, or 4 on the pre-select buttons - once you have entered the correct number press and hold down AS again
Rgds
Adrian
                
 Adrian Murphy
                
 April 2008