It is not exactly a wire on its own
The OBC info is sent over the Kbus to display on the screen afaik
If the nav was not connected to the Kbus you would not have anything working at all!
I suspect you have an early car and the cluster is not sending obc info to the correct bordmonitor address, Some owners of earlier cars had the same problem.
Try a resler K bus interface and see what is being transmitted on your car.
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