What car android screen need to add the AMI Cable?

2009-2016 A4/A5/Q5, 2012-2019 A6, 2012-2018 Q3

What circumstance need to add AMI cable?

Only when the car has AMI port and without AUX. You can check your car glove box or somewhere to make sure if the car has AMI port. After adding AMI cable, the sound will be able to play.