See also:

Programming
Turn thumb wheel 1 to the "LIMIT" position: the speed limiter mode is selected but is not switched on (PAUSE). You do not have to switch the speed limiter on in order to set the speed ...

Fuses under the bonnet
...

Weights and towed loads
* The weight of the braked trailer can be increased, within the GTW limit, if the GVW of the towing vehicle is reduced by an equal amount. Warning: towing using a lightly loaded towing vehicle may h ...