It does not define connectors for car audio, which are defined in ISO 10487.
Head units are generally designed around the single (180 x 50 mm panel) or double DIN (180 x 100.3 mm panel) sizes, with a recent trend towards the latter with the increasing popularity of large, touch-screen displays and interfaces like Apple CarPlay and Android Auto.[3]
Gallery
Uniden BCT-15 installed into double DIN using a spacer pocket
Alpine double DIN head unit
References
^"ISO 7736:1984". International Organization for Standardization. Retrieved 15 June 2019.