What is the function of the port?

It’s increasingly used as an access point to other in-vehicle electronics systems, subsystems, computers, sensors, actuators and an array of control modules including the air bag control module. The onboard DLC is also used as a serial port to retrieve data elements from on-board systems, subsystems, modules, devices and functions that collect and store data elements related to a vehicle crash such as a restraint control module (RCM) and event data recorder (EDR).

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