I have a 2013 Tacoma LTD with the JBL
Premium Sound and Navigation and definitely notice missing functions when the vehicle is in motion. For aftermarket head units, the way to get around this is to run the speed sensor wire from the HU to ground (it was either that or a wire that was supposed to go to the parking brake to perform the same function, disallowing functions while the vehicle is in motion). I recently bought a 2009 Tacoma Factory Wiring Diagram because I know that Toyota typically maintains wire colors for specific functions throughout recent model years). I am having a little trouble finding where the sensor enters the HU, but it looks
like Raul Duke was right, that it is a Violet/White wire. Does anyone have any clue as to what to do with the wire once found or do we need to go further and invest in LockPick or the Navigation Enhancement Unit?
Any help GREATLY appreciated.