2007 silverado factory nav
Printed From: the12volt.com
Forum Name: Mobile Video, GPS, and Navigation
Forum Discription: Mobile Video Head Units, DVD Players, LCD and TFT Monitors, Navigation, GPS, PS2, PS3, XBox, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=107417
Printed Date: April 27, 2024 at 5:22 PM
Topic: 2007 silverado factory nav
Posted By: patchadams69
Subject: 2007 silverado factory nav
Date Posted: September 13, 2008 at 9:27 PM
I have a new body style 2007 chevy silverado, installed the factory gm navigation system. Everything works except for the gps cannot get a signal, everything is plugged in in the back of the unit. Any suggestions??? Seller recommended a VSS wire, is that all I need? I must be missing something
Replies:
Posted By: i am an idiot
Date Posted: September 13, 2008 at 10:45 PM
Did you connect the GPS Antenna? The lack of a VSS wire should not keep the GPS from getting a signal.
Posted By: patchadams69
Date Posted: September 13, 2008 at 11:58 PM
Yeah the gps antenna is plugged in and is placed under the dash as instructed, I even pulled the unit out and pulled the antenna out I still no gps signal, its all brand new. I called gm tech support and still no help from them after trying a couple different procedures.
Posted By: KPierson
Date Posted: September 14, 2008 at 7:48 AM
Depending on the exact nature of the problem a VSS signal may help. Most navigation systems use GPS to initially locate your current position in the internal maps. It then ujses the VSS and an electronic compass to move you around inside the maps. While you are moving it will periodically compare your location to the GPS location and update if necesarry. But, if you arn't moving it doesn't bother checking the GPS information. So, if the GPS starts out on your current position but the position never moves I would look in to hooking up the VSS wire. If the GPS never finds your location maybe the antenna is bad? ------------- Kevin Pierson
Posted By: megaman
Date Posted: September 14, 2008 at 9:52 AM
First, the GPS antenna must have a line-of-site to the sky. Under your dash does no good for signals to your GPS antenna. Place the antenna up on the roof and then drive around with it like this. If after a few minutes it doesn't get a signal, you most likely have a bad antenna. What I do to test the accuracy of the navigation, is cover your windows with some newspaper. Then drive around with nothing but the nav guiding you. If you don't hit anything, then you're good. btw....jk.
Posted By: KPierson
Date Posted: September 14, 2008 at 10:02 AM
My OEM GPS antenna in my G35 is under the dash with absolutely no line of sight to the sky.
-------------
Kevin Pierson
Posted By: megaman
Date Posted: September 14, 2008 at 10:11 AM
This baffels me that you get a signal. Whenever I've tried that or seen it tried by fellow installers, it never works. I obviously know less about the GPS signal than previously thought. One of those voo-doo things with me that I know what works for me and I go with it. Maybe it's not covered by metal material, and the signal goes through the front windshield and the plastic dash? For example, one of my clients with an 07 camry, had his GPS antenna mounted to the top of his trunk lid. When he went through the car-wash and they popped the trunk to dry the lid off, the antenna got pushed into the trunk. He lost his signal immediately and came running back to my shop because "something is wrong with my nav!" So the antenna didn't have line of sight to the sky, and was underneath the metal trunk lid, no signal. So maybe the antenna can get a signal through glass and a certain degree of plastic, but is thwarted by metal?
Posted By: patchadams69
Date Posted: September 14, 2008 at 11:05 AM
Yeah, you see the problem is that I live in Wyoming and it shows my position in downtown Washington DC, and when I drive it never moves and I get GPS up in the upper left corner of the screen with a red line thru it and thats all I get. So I'm guessing its a bad antenna, but its all brand new so I'm hoping that I just didn't hook something up, haha but I'm gonna hold off putting newspapers on my windows for a while I think hahaha thanks though.
Posted By: Mike M2
Date Posted: September 15, 2008 at 9:41 PM
The factory GM nav needs a VSS wire connected. Without it it will not track correctly. You need the brown plug on the back of the nav, it's on that(most times it isn't there unless the truck already came with one). I have one out in the truck if you need pin location in the plug. The easiest place to access VSS is on the back of the distribution block under the dash to the left of the brake pedal. Pull it out and spin it around, it's a GREEN / WHITE wire on the center plug. The factory location for the GPS antenna is to the left of the defrost vents. That panel pops up easily and there's a spot under it. ------------- Mike M2
Tech Manager
CS Dealer Services
Posted By: diagnall
Date Posted: September 16, 2008 at 4:23 PM
Your other left lol, the factory location for the gps antenna is a flat plate with a vertical tab just "right" or the defroster under the foward panel on the dash.
Posted By: patchadams69
Date Posted: September 16, 2008 at 10:10 PM
Ok thanks guys........I did purchase a new VSS wire on ebay and hopefully that will work
Posted By: i am an idiot
Date Posted: September 21, 2008 at 4:44 AM
patchadams69 wrote:
Ok thanks guys........I did purchase a new VSS wire on ebay and hopefully that will work
??? Did you mean a new Antenna?
Posted By: jdseiver
Date Posted: October 05, 2008 at 1:10 AM
I am also looking some help locating where to hook up the Vss wire on a new body style 2007 Silverado. I bought a used 2008 nav system out of a tahoe. It came with all the parts, GPS antenna, and VSS brown plug. My truck only has two of the four connectors for the rear of the unit. Is the 2nd one from the drivers side for the rear entertainment system? I do not have rear entertainment so should I only have 3 connectors other than the FM antenna and GPS antenna? The brown plug with the VSS wire has a external video input and a green wire (VSS) and a twisted pair of red and black. I guess I need to know what to do with the Red and Black wire although I assume they are power for a video camera. I do not have a back up camera either. I was told the green is the VSS. Does anyone know this info for sure?
Posted By: Mike M2
Date Posted: October 05, 2008 at 6:39 PM
The factory VSS color is GREEN / WHITE.
-------------
Mike M2
Tech Manager
CS Dealer Services
Posted By: jdseiver
Date Posted: October 06, 2008 at 2:01 AM
Where can I hook into it?
Posted By: Mike M2
Date Posted: October 11, 2008 at 8:00 AM
If there isn't a GREEN / WHITE behind the radio the easiest place to get it is on the back of the junction box. It is located under the dash on the firewall just left of the column. Pull it out and flip it over, the center connector has a GREEN / WHITE...
-------------
Mike M2
Tech Manager
CS Dealer Services
|