Auto hold not working

Here are a few suggestions to possible causes on these sites ,

http://www.pistonheads.com/gassing/topic.asp?h=0&t=663792

and

http://www.honestjohn.co.uk/forum/post/index.htm?t=63989

Thanks for the info "Whittingehame" I understand the function and use of auto hold,my problem is the button once you press it the light in the button will not function and I have tried an hill start,the system won't engage the car just
rolls backward.With it being electrically operated I was hopeful that it may just be the button at fault,I have just had the parking break
button replaced at a volkswagen main dealer 115 pounds(ouch!!)thats why I was hoping it is just a fuse!I apollogise if my original qustion was a tad misleading!!!
HELP

Cant tell you if it's covered by seperate fuse or not , dont have data on fuse layout . If they replaced button to cure this fault and it did not , take it back and tell them you still got this fault .If they carried out a scan it should show what is causing the problem .