Hey Guys! This is my first post on this forum. I just got done (thanks to this thread) with installing an OEM Nav unit into my 08 GMC Sierra. It has Nav, DVD and Rear back up Camera with Bose. Install went great. However, My Nav doesn't work. It like it's not reading the signal coming from the attena. WTF? The Unit turns on on shows a map of Washington DC. I live in Seattle Washington I bought the an unlocked unit so that I wouldn't have to take in the my dealer. Please tell me that I don't have to deal with those Idiots.

~Rookie

 

Did you add the VSS circuit to the radio?

 

All the documentation that came with the unit said nothing about this wire. Simply plug and play. I've read some posts on here concerning this issue. What do I need to do and where do I get the parts? Thank you.

~Rookie

 

There is info in the forums about this.....

I will say the it goes into the brown connector, pin 5
and it needs to be connected to the back of the junction block under the left side of the dash.....you're looking for a grren\white wire

 

so i guess from what all i have read that unless i have the blose i am screwed i have everything except the 2 plugs for the vss and the voice into the onstar unit but i can only find them on ebay for $75 anyone see them cheaper any where also has anyone ever tryed to install the blose amp just to use the navagation i have found one for $30 or will i need the harnesses comming off of it i was thinking about making some kinda jumper but i have no idea

 

I have a 2008 Sierra Denali and purchased the HU: 15940103 as well as the Map disc and antenna.. I see other mention in this thread about VSS harness and C1 connector...Am I going to need these as well? thanks

 

Is there a oem nav/dvd for 08 2500hd lt non bose that you dont have to add an amp too??

 

You cannot just "add" the bose amp. There is too much wiring involved to make it worth it. the easiest way around it would be to add an aftermarket 4 channel amplifier. Without the amp, your audio will be very low.

You don't NEED the Onstar connector. what won't work is the voice recognition. what you do need is the VSS. without it, the voice guidance, mapping, and re-routing will not work

 

greatly appreciate the info. this looks like the one(?): http://cgi.ebay.com/ws/eBayISAPI.dll...:X:AAQ:US:1123

 

Anyone in the Orlando w/ experience interested in doing an install on my 2008 Sierra Denali? I am upgrading to a NAV/DVD head unit..Ive got all the parts ready..you can email at craig@doudney.com if interested..thanks