AutoImporter no longer import my photos, after switching to iOS 10.2
There might be multiple solutions to this:

Verify Auto Importer settings


Go into Finder
Hit CMD + ⇧ + G
Enter the following path: /System/Library/Image Capture/Support/Application/
Open up the AutoImporter.app
Hit ⌘ + , to open up the settings
Verify, that everything is set up the way you want it to be.
Retry by reconnecting your phone.


Reset Auto Importer start


Open Image Capture
Set the Connecting this iPhone opens: option to something different then "Auto Importer", like Image Capture.
Reconnect your iPhone, see whether it opens Image Capture.
Then alter the setting back to "Auto Importer".
Reconnect your phone and see whether it works.


Delete Auto Importer Prefs and Cache


Get AppCleaner (Freeware) or an similar App, because it's hard to locate the cache for Auto Importer by hand.
Open up AppCleaner and drag the AutoImporter.app onto it.
AppCleaner will show you the pref and cache files associated with AutoImporter


com.apple.AutoImporter.plist in ~/Library/Preferences/
com.apple.AutoImporter folder at /var/folders/[…]/com.apple.AutoImporter/

Delete the plist and the cache folder.
Restart AutoImporter.app (for me it auto quitted itself after the first start, so restart it once again).
Retry by reconnecting your phone.