Such a module can be used to turn on dash when starting the engine - this device has a function of supplying phantom power to the devices connected to it.
But there are too many connectors in the photo, probably in your example the device is used for diagnostics.
The simplest
PAC IGN-3 Latching Phantom Ignition Module connection diagram - plus is modulated on the blue wire when the engine starts (when the voltage rises to about 13.0 Volts).
About the module:
https://catalog.pac-audio.com/catalog/signal-triggers/ign-3
User Manual Here is where i am going to purchase it from , it is designed to run most thinkware cameras
https://us.thinkware.com/product-page/echomaster-obd-ii-power-cable/