It's possible the pin is corroded on the inside and not making good contact with the connector on the display unit. Also, reflowing the solder on the connector of the display unit is a good idea since the harness flexes every time the backbox door is opened, and that flex transmits force to the connector, causing the connection to break. You might read continuity while the door is open, but once the door is closed, the flexing may have caused a loss of continuity. Reflow the connector first before chasing after the pin.

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