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Yesterday, a Ranger came to try to install software updates that kept failing. He removed a large unit from under the console and plugged his laptop into a plug like the one shown in the previous post. I couldn’t believe the incredible screens he had access to. Would love to be able to go through those.
For sure it is the diagnostic port. I use this to connect the adapter and a BT dongle to run TM-Spy and ScanMyTesla.
It is said that this port is read only, and there is another smaller 4-pin Ethernet port for s/w update.