Here is a little writeup with the pros / cons, follow along if you wish, what you do to your truck is YOUR problem, not mine. I will answer any questions if I have time.

This mod will allow you to enter address destinations while moving and or POI, without spending $250+

WARNING: THIS MOD ONLY WORKS IF YOU WORK IT. Ie, throwing the switch only works for about 30 seconds, then you have to switch it back for 5, then you get another 30 seconds of entry... if this isn't for you don't do it.

I am working on a solution to this. Some timed switch


1. Order the Lockpick Harness from this place: http://tvandnav2go.com/contact.html

I am not endorsing them (ad), but they were the ONLY place that would sell me just the harness and not the whole damn thing. Costal tech was real bi*ch about that....

2. Seperate out the connectors you will need from the rest. You need the brown to brown one. You will have to cut some wires here! Be careful, you only have so much to work with.

3. Since we are not installing the lockpick, you will have to create the wires between the backup camera and sat nav, I used small speaker wire, it worked fine.

4. You are adding a switch to the 5th wire in, from GM it is green/white, on this harness it is green/black. (see pics).

5. place the switch whereever, but I'd keep the run short since I don't know if impedence will affect the operation.

6. The theory is that opening the switch (off) will make the headunit think you have stopped.

The REALITY on my 2009 is that it will think you have stopped, but only for about 30-40 seconds. THIS MEANS, while driving, you flick the switch 'off' when on the 'dest' screen, enter the city. Flick the switch back ON for 5 seconds. Then OFF to enter the street / number, then ON to resume normal ops.

The system, bastardly times out somehow after 30-40 seconds. Leaving the VSS wire open (swich off) shows you driving in circles on the screen, turning ON (closed) will relocate your vehicle within about 10-15 funny seconds.

If this mod is worth it at $200 less than the lockpick, great, if not, it's not for you.

For me, it still beats pulling off the road at 70 MPH just to find a McDonald's when any $100 GPS can do the same damn thing without modification. And I saved $200. Also, this mod is 100% removable, just remove the connectors you added and ta-da, factory.

 

Nicely done - you're braver than I am when it comes to cutting wires. I don't understand why if the VSS is open, it times out. Why isn't it permanent until you flip the switch again. The Lockpick times out after about 60 seconds - I wonder why it's longer than your mod?

 

I timed it; it's actually about 10-12 seconds.

I am guessing the lock pick doesn't break the connection, only changes it... either makes the headunit think you are under 8 MPH or it reconnects then disconnects... in either case, i have tried like you wouldn't believe to get at the software on the head unit and just remove the line that prevents this... that would be the best solution.

I didn't splice / cut any factory wires, just what I added

 

Price on the Lockpick is down to $219 delivered. Received it the next day after ordering it.

 

don't forget guys, not only do you have a VSS signal to the radio, there is also a GPS antenna that is moving which is probably why the dest input is timing out

great idea though, too bad its timing out on you

 

While driving to work today; I had an idea. What if we used the switch (or 2) to 'cut' both the VSS AND GPS wire?

would that let you do whatever you wanted to the unit, while moving, to enter an address, then flip the switch(s) back?

I got so ticked at the whole thing I threw out my $50 harness... so I can't test this now or ever, but to anyone else who's done or is thinking of the VSS mod, if we interrupt both the VSS and GPS signal, then the unit should think the car is parked under a bridge w/no GPS... and... NOT MOVING...