I have been following this thread with great interest as I have the same problem as the OP. However having done the dash test and removed the IPK I found the seals on the IPK still in place and having split the IPK I have found nothing covering the LEDs.
However the dash test showed me that not only was the airbag light not illuminating when it should but also the seat belt light on the dash doesn't light up.
Airbag and seatbelt lights are beside each other at bottom right of the dash.
Picture of dash test below showing neither airbag or seat belt light illuminated.
Any ideas? Can't get the car mot'd until I get this sorted.
A friend of a friend mentioned something about the seat belt tensioner??
Thx
Paul
dash.JPG