Rear View Camera & Rns510

Here is my problem...

I've got a VW Golf V (MkV) with RNS510, and I've mounted (now working)
OEM Hybrid TV Tuner, using the VW touareg wiring for RearCamera and TV
Tuner.

I've got Rear Camera module from VW Tiguan, and from VW Toaureg too,
but I can't do it work.
Whit Touareg unit, I can recode it, but can't calibrate, and I've got
nothing at RNS510 screen.

Whit Tiguan unit, I cann't recode it, I can't calibrate it, and I've
got nothing at RNS510 screen.

Anyone can helpme??

Best regards from spain.