Hi Richard,
I thought it may be a bit late to help you

but as I had just had to work out the same problem, I thought it may help others to put an answer up - trouble with the Modus is it's so hard to get information. I have even had to go to French and German forum sites. I had great fun trying to follow instructions to replace headlights with instructions translated from the German a couple of years back.
Glad you managed to work it out anyway, very little about the modus is obvious, as I'm sure you know.
Nigel