OEM Navi Bypass

[f5fstop]

Originally Posted by Rick

You've probably already read about this but most aftermarket NAV systems have a wire that goes to the brake. If you ground this wire to the firewall instead it fools the system to allow you to program it on the fly.

Not true for the AVIC Z1, earlier models took a flasher module built wired into the illumination wire, newer models require a wire to be added. But, the lockout features can be bypassed.

[Boar-Ral]

You can use the factory navigation system by installing a switch on the VSS (Vehicle Speed Sensor) wire going into the back of the headunit.* You could simply disconnect it, but you will lose some accuracy doing this.* There are a few writeups on the internet showing you how to do this.* Here is one on CAFCNA.* If you search there for VSS, you will find about a half-dozen other writeups on it, with lots of information.

[f5fstop]

Originally Posted by Boar-Ral

You can use the factory navigation system by installing a switch on the VSS (Vehicle Speed Sensor) wire going into the back of the headunit.* You could simply disconnect it, but you will lose some accuracy doing this.* There are a few writeups on the internet showing you how to do this.* Here is one on CAFCNA.* If you search there for VSS, you will find about a half-dozen other writeups on it, with lots of information.

You can try this, it MIGHT work, and it will not take that long to try it out. But, the newer vehicles with the new style BCMs are controlled differrently. The H3 has the latest BCM model, and does things a lot differently.
So, the question is does the nav use the VSS for accuracy as well as lock out of the features, or on the H3, does it use it only for accuracy?
Again, I have no idea, but it might be worth a try to see if it works.

[Waiting on my Black H3]

There is a bypass so you can use Nav on the run. Go to the Tahoe forum and you will find part number to buy. tahoeforum.com
I have been interested myself. Have a 2006 H3 since July 05, and now wanting to purchase a new Black 2007 H3 with factory Nav. ALso want to hook up a rear camera to it like the Tahoe has from the factory.

[HummerNewbie]

Originally Posted by Waiting on my Black H3

I have been interested myself. Have a 2006 H3 since July 05, and now wanting to purchase a new Black 2007 H3 with factory Nav.

Are you going to Dew Hummer's Happening in late October?

[Boar-Ral]

Originally Posted by Waiting on my Black H3

There is a bypass so you can use Nav on the run. Go to the Tahoe forum and you will find part number to buy. tahoeforum.com
I have been interested myself. Have a 2006 H3 since July 05, and now wanting to purchase a new Black 2007 H3 with factory Nav. ALso want to hook up a rear camera to it like the Tahoe has from the factory.

I do not know if it is the same thing, but I have heard of a company called Lockpick that makes a device that you connect to your factory headunit to allow you to use navigation and DVD functions while moving.* It might be similar, and might be worth checking out if a VSS bypass doesn't work on the newer headunits.

[rjmoose]

Well, here is what I came up with:

http://www.coastaletech.com/GMLOCKPICK.htm

It looks like it might work although they do not specifically mention that it will work on a 2006 H3 OEM NAVI.....I e-mailed them to find out. As soon as I get an answer back from them, I will report back to you guys.

Regards

[f5fstop]

That interface, as designed will not work on the Hummer H3; reason, the connector they show, is not used on the H3. In addition, they are turning the system on/off via the steering wheel switches which signal the BCM via the low-speed LAN circuit.
However, they might be able to make one for the H3. It is evident, by the connector they are using, they are somehow messing with the BCM signal via the low-speed LAN signal from the BCM to the NAV unit. So, since it appears the BCM is the controller of the functions, all they would have to do is figure out how to control the BCM signals to the H3 head unit.

[Boar-Ral]

Originally Posted by rjmoose

Well, here is what I came up with:

http://www.coastaletech.com/GMLOCKPICK.htm

It looks like it might work although they do not specifically mention that it will work on a 2006 H3 OEM NAVI.....I e-mailed them to find out. As soon as I get an answer back from them, I will report back to you guys.

Regards

That one will not work, but as previously mentioned, the company that makes the Lockpick does have one in the works.* See what sort of response they give you.