Disconnect both battery cables and touch them together for around 20 secs.

This discharges the capacitors. If the capacitors are not drained while airbag is removed/installed, expect a BIG, dusty BANG!!!

__________________
'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!