Welcome to the club mate, hope its just that youve not "pushed the button" as it could cost £££, where as red faces are free and much more enjoyable for us.....
I've fixed the problem and it wasn't the button at all.... It was very complicated... erm...
I'm putting it down to having just gone from my 1996 Celica which has almost identical controls.... except you don't have a button....
Sincere thanks for the tip. I shall endeavour to continue to entertain with my ignorance / incompetence....
Cheers
DTR