Tv Button

[ligurt]

Hi there I have a 2002 lexus is200 with oem sat/nav system whose remote controller have the off button that turns off the screen and send an unknown signal to the (if I well remember) 1 and 4 pins on the six pins plug on the navigation unit. I also get an altezza nav controller that has a tv button instead of. Is it for headrest monitor or turn it the tv on the nav screen when the tv tuner is connected? in first Altezza model the tv button was on the radio and it seems to be logicl, couse the sgd and pbk connectors are on the 5 pins plug on the radio itself, but in the latest model it is on the controller, but the 5 pins plug is still on the radio. Moreover first models have both integrated or external amplifier, while latest have just integrated. If someone here has altezza tv/audio/navigation wiring diagrams from 99 to 2004 models it would be greatly appreciated.Another great option would be if someone let me know who in the forum is the expert on this topic.

Thanks to all of you for any help

Pietro