1 Replace the battery
2 the led should be glowing
3 Within the vehicle
3.1 push the remote buttons and wait for the led to go out and come on again
3,2 for  second time carry out 3.1 above
3.3 press remote button for a third time.The LED should flesh and the Alarm will sound
4 The remote will now work normally
The above has been taken from my instuction book for a 1218T2 scorpion alarm and I have been doing this since 1991 on my camper.Hope that it works for you
                
 frank
                
 February 2010