Over speed warning

Mine is a 3 window High Calais
Model but I believe this is the same for Single displays as well.

There are 3 different modes
Just to get technical.
Normal single overspeed,
use Up / Down to adjust 5 km
at a time.
1-4 overspeed,
use Up/Down to choose.
And OFF

With Ignition on,
Hold Mode button to change from Single to 4 Mode.
Hold Up and Down together to
turn off all speed warnings.

With Ignition off,
Hold Mode button and turn on
Ignition then release.
Now press mode until you get to the overspeed menu.
If in 1-4 Mode you will notice
Up and Down only toggles 1-4.
When you see one that you
want to adjust, press both
Up and Down together once
and it will now let you adjust
it in 1km steps then press
both Up and Down once to
save your choice Speed warning.
If you choose 0 it will
deactivate that memory
position.
I hope this helps but if you are still having trouble then you may need to replace or clean the switches.