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Yep. Pin 3 should definitely be ground.
Odd though. If pin 3 isn't grounded, the remote unlock shouldn't work.
I'm guessing that the left unmarked terminal of M17a is pin 2 and is the drive for the unlock servo.
These would be on another schematic for central locking.
The middle unmarked terminal of M17a may not go anywhere.
Either that, or the connector actually has 4 pins, and that's the "hey you're driving with the trunk open" indicator.
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