I have a 2010 Ford Focus 1.6 Titanium and although the frost warning light comes on below 4 degrees C there is not an audible alarm.
This has been the case since I purchased the vehicle 12 months ago, is it possible to switch this off and on.

 

If the car runs a canbus system like vw's then you would think so.

 

If it does run this system how do you switch it off and on

 

You need a lead and some software that will communicate with the interface.

VAGCOM is the vw version. Speak to your local auto electrician.

I'm sure somebody on here will be more knowledgeable than me