Ford immobiliser light on all the time and flashes

jason18, May 14, 5:07pm
while I drive. Can still start and drive. Happened after left parked up for a few days.

jason18, May 14, 5:08pm
99 AU Falcon

nave12, May 14, 5:20pm
x1
Is that the smartshield light!.

jason18, May 14, 5:46pm
Yeah thats the one

nave12, May 14, 8:23pm
I think the 99 au still uses the older type smartlock system(same as eb onwards) and i had an issue similar to yours where the smartlock light would randomly stay on now and again but my car (eb fairmont) was starting to not start randomly so i changed the bcm which was hidden behind the speedo cluster and is about the size of a dvd case but thicker.After changing it everything has been perfect,the electrics can get dry solder joints in them(inside bcm) and sometimes can be affected by heat,cold,moisture and play up a little bit but 99% of the time they usually work swell.