Hybrid tuner

Hi all, just fitted to my RR Vogue se 2006 1 x RANGE ROVER L322 - LEAR HYBRID TV TUNER - LR014222 - 7H42 19C063 AB (Brand new unused unit) to replace the analogue unit, we now have digital channels & sound but no screen display. Read somewhere that the head unit has to be told that digital box has been fitted but cannot find it now so can any one help ?

Rich Hall