Dash Errors / Immobiliser

My bike has a few errors in "Memory" , 03,04,06. I tried to clear them but that didn't work. Now error 04 is playing "see me, now you don't" and alternates between cleared and stored. Why?
Where abouts on the bike is the Immobiliser?

Instruments/dash. The immobilizer aerial is up near the keyswitch.

Yup, my guess is antenna. To get to it you have to remove the ignition switch which is a right frontbottom of a job because it is retained by snap-off security bolts. Cut a slot in them and wind them out and when you replace them just use ordinary allens.

I have an antenna in stock, they aren't terribly expensive.

Pete