• Tiny
  • copperavery
  • 2008 Hummer H3

Electrical problem
2008 Hummer H3 V8 All Wheel Drive Automatic 24,400 miles

Am installing and aftermarket NAV unit and need the loction/color of the VSS (speed sense) wire. The ca does not have factory Nav, so It doesn't seem to be in the factory radio harness. Where can I tap into the VSS for the add-on NAV unit? Thanks

Tuesday, August 25th, 2009 AT 10:30 AM

1 Answer

  • Tiny
  • factoryjack
  • Expert
  • 4,263 posts

There is not a VSS circuit, it is all done through a communications buss. I don't dabble in aftermarket audio, but I have seen some installations that have an interface module installed, that may be what you need. I would quiz an aftermarket installer, and see if they can provide you with some information. The factory schematic is the same for radio, or nav, and it has the buss circuit involved. The base system probably uses speed info for speed dependant volume, whereas NAV would use it for that, and GPS calculations.

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Friday, August 28th, 2009 AT 1:47 PM

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