I think it's a DC barrel connector (5.5mm OD x 2.1mm ID) used for some accessories. leave nests. I have a DBPower jump starter and it plugs into the auxiliary socket. However, the power indicator does NOT come on until I jumper the chassis ground pins on the data link connector when I am not in the vehicle. Tomorrow I'll try to use it and we'll see if the LED stays on after disconnecting the car battery. If I jumper the chassis ground pins I see power (12V) on pin 16. If this works on the car I can upgrade it to 5 stars. YMMV.
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