in the old air pump systems and IR sensor there are a few issues.
if you have the IR system not Radio then the sensors are in the rear view mirror, you have to point the key directly at it for it to work and on a sunny day, it doesnt work.
if you have the radio system and have programed the key and still no joy then you have to check a couple of things. pumps tend to go, if you dont get the wurrrrring sound when you press the key then either its not sending the right signal or the pump has gone.
if the pump is wurrrrrring but nothing happens, then you may have a leek or the drivers door lock mechanism may need to be replaced as that fires off all the other locks.
basically the systems on the mk2s were never great and as they get old due to the design they fall over.
check these things, i went through it all with my mk2 cordy. good luck. or just accept defeat
