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I did install the vss and onstar harness. However, I am now questioning if the wire tap is making a solid connection on the vss wire. My question is if the vss connection is bad would that prevent turn by turn instructions from appearing at all?

I installed an OEM navigation in my 2008 Yukon per the instructions, but no turn by turn guidance displays on the screen. All that shows is my vehicle traveling along the main zoomed out map. The voice guidance is turned on, but it only prompts me when I reach my destination. any ideas?

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Hi, I recently installed an OEM GMC navigation unit in my 2008 GMC Yukon. I purchased a harness to connect to the onstar and I tied into the VSS wire. The problem is my vehicle shows up on the map on the left hand side of the navigation screen, but the right hand side just shows a compass and...