MK 4 sat/nav dvd fitted into range rover 2003

[keviboy]

Hi there people, i seem to have a slight dilema. I upgraded my sat/nav system to the MK 4 dvd unit with all the postcode search etc and everything seemed the same except that on my menu screen it says Aux-ventilation and nothing about Aux-heat so am unable to use my timer mode for the Auxilary heating, the aux ventilation works fine but obviously will not ignite the fuel burner which is fitted standard but does work the fan etc, so can anybody please put me in the right direction as to how i get the "Aux-heat" onto my screen menu, is this a matter of a dealer re-programming the unit and telling it that i want aux-heat. My vehicle is the range rover 2003 model. L322 diesel TD6.
Thanks people

keviboy