When you launch Connect, users will be able to select the brand of their vehicle from a list before they enter their credentials and grant access to your application.

Default Smartcar Connect Flow
Connect can be launched with three different workflows (defult, single select, and single select with VIN). Depending on your use case and what information you have about the vehicle ahead of a launching Connect, you may be able to leverage one of these flows for a more streamlined Connect experience.
Default Smartcar Connect Flow