These can be a right pain to programme. Remove all the metal key parts
from the plips, you need to get as close as possible to the roof
receiver. Use one of the metal key parts and put the ignition to the
accessory position. Then within 10 seconds hold the plips one at a
time next to the receiver, with the side where the metal key went
pointing at the receiver, and push the large button down for two
seconds (until the light stops flashing). Remember all three have to
be done withing 10 seconds. Then switch the ignition off and try them.
You may have to repeat this a few times to get them all working. If
one does not work don't be tempted just to programme that one again by
itself. It will throw the other two out!!  Be patient and good luck.