Use a different key blip??

[Piggy]

Get yaself a new fob/new guts and a new battery...

then:

ensure all doors are closed and unlocked
put the key part in the ignition and turn it to ignition point 2 (so you will need to remove the key part from the fob or use a spare key)
then point the fob at the receiver, near the front interior light, within 10cm or so.
you may need to press just the unlock/lock button or also press the double lock button.
but either way you will know pretty soon if it has worked but turning the ignition off and trying it!