(Please be patient, there are alot of pictures)
I have a 2008 Acadia SLT-2 with factory navigation, dvd player, radio, back up camera, etc. I wanted something cheap & simple to use that will allow my passenger to enter addresses while moving.
I looked into other electronic add on alternatives but they had many features that I did not need. I simply do not need the ability for me or the passenger see the dvd while moving, or use the back up camera when not in reverse or have extra cameras, etc. I also wanted something very simple to use as my wife and our parents who are in their 60's use my car from time to time. They simply would not remember which button to hit, how many times they need to hit it or any other sequence of buttons to get it to work.
I decided to install a simple on/off switch I got from Radio Shack for $2.99 plus tax to the nav's vehicle speed sensor to trick the nav into believing that the car was not moving. This allowed me to enter addresses and bypass the nav lockout at any speed. This is the switch I got: http://www.radioshack.com/product/in...ductId=2062523
My inspiration came from this mod I found for corvettes: http://www.kawal.net/navigation.htm
Step 1: remove the radio trim
Step 2: remove the 4 bolts holding the radio with a 7mm socket and slide the radio out slightly.
Step 3: The VSS wire is located in the brown radio connector closest to the driver's side. It is the green/white wire at the 5th "slot". I simply cut the wire and spliced 2 additional pieces of wire that end up going to the switch. Run the new wires down and under the radio. Reconnect the brown connector to the radio and rebolt the radio to the dash.
Step 4: I decided to mount the switch into the small cubby next to the accessory power outlet. I temporarily "hung" the radio trim to the top of the dash to have better access to the lower center console.
Step 5: Remove the lower center console trim which is held on by clips. Start at the back and work your way forward. As you are going forward tilt the back up higher and higher as there are tabs that go into the dash. If you just try to lift the whole piece up you will break the tabs. Please be careful as the plastic seems really fragile. You will also need to put the gear selector out of Park so the trim will clear as it is removed.
As you can see in the last photo I also pulled out the side trim panel to see what was holding it in but it is not necessary for you to do this.
Step 6: Remove the 2 phillips screws that hold the lower cubby and unfasten the electrical connectors to the switches and power outlet.
Step 7: Drill out the cubby where you want to mount the switch. I bent the switch contacts in as I thought it would clear the center console between the seats. Since it did not, I had to notch the center console so the switch would clear. In retrospect, I could have just drilled a hole through this too and not bend the contacts for a cleaner installation. This is not an issue as the trim will be covering all of this from view.
Step 8: Reconnect the connectors and refasten the lower cubby to the dash and then put all the trim back. Here is the finished switch.
Now when driving just normally have the switch so the nav always gets the VSS signal. Everything functions as normal.
When the lockout occurs and you need to enter addresses simply flip the switch and the lockout is gone. After entering your information just flip the switch back to normal position so the nav will retrack your position after 1-2 seconds.
Here is the car traveling 35 mph. As you can see there is no lockout after I flip the switch. I can select "address entry" and enter an address.