~~~Navigation Lock Out Override~~~
The fact that Toyota took it upon themselves to lock out many of the capabilities of our factory nav systems always annoyed me. Now, not even you passenger can input a destination address, search for POI's etc. Very annoying.
In the past, Toyota and other nav. unit manufacturers made it easy for us to bypass this lock out by simply grounding out a wire that was supposed to be connected to the parking brake. Now, they have gotten smarter and the lock out feature is facilitated by the vehicle speed sensor and GPS - slightly harder to bypass.
One of our members here on the board (J.A.) makes a nifty little "black box" utilizing a 555 Timer to intercept the vehicle speed sensor (VSS) signal and outputs an artificial VSS signal that shows the car as going less the 5 km/h which is the cutoff for the nav lockout. Installation is cake - just pull the nav unit, find the G18 Grey plug, find wire #3 which is a sky blue 24 gauge wire, snip it in half - splice in the input and output to the correct locations on the black box, ground the box, and wire it to switched power. Now, not matter how fast you are going, just flip a switch and you regain all usability of your nav system so your passenger can input destinations etc.
See here for more info:
Toyota 4Runner Factory Navigation Override and Unblock Bypass Module
***My passenger took the pics shown***
Here are the pics:
Traveling down freeway, nav in normal config. Locked out.
"Black Box" switched on, functionality regained.
Back of the nav unit
Black box wired up
The module itself