parking break
I found this link, apparently the parking break has to be applied for the AV setting to be engaged.
How to get Toyota Entune to play videos
LED temp
I have just noticed the same problem on mine, I have heard that sometimes the LED(if not the right one) can melt the seal on the housing. Looking into this for myself. I took out the halogen bulbs and replaced them with sealight H11 bulbs. super bright but the OEM are h16 I believe.