VSS wire is in cavity E and it is a dark green/white wire and by the updated wiring schematics it is only avaiable with the navigation system. If you have XM the XM Right audio signal comes in on terminal H and it is dark green/white.
The wire might be there standard for any application, but only used by the NAV, or GM made a wiring change.
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Black Sheep Hummer Squadron
(ME TOO)
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