This mod was done so that my passenger
can use the usually grayed out features of the Nav / Phone screens. THE DRIVER SHOULD NEVER USE THESE FEATURES. DO NOT WATCH MOVIES WHILE YOU ARE DRIVING. If you "rear end" someone while trying to type "Dunkin' Donuts", you were warned !
Having said that...
The Nav bypass on a Murano LE is quite easy. Unlike Lexus / Toyota which detect movement using both the GPS and Vehicle Speed Sensor, Nissan only uses the speed sensor. Nissan also uses the parking brake signal for video. Both of these signals are available on one connector on the rear of the Nav / Hard drive unit in the center dashboard. The parking brake signal input to the Nav may be safely grounded as its only purpose is to keep the video from coming on when the brake isn't applied. (Don't worry about the warning signal that alerts you when you leave your parking brake on, it will still work. The wire splits to the combination meter ( that's car talk for the dash speedometer cluster) and then on to the Nav unit. If it still bothers you, you can get a Double Pole Double Throw switch instead of a Single Pole Single Throw switch and have it back to stock when the switch is off.)
So in a "nutshell", the mod is to ground the parking brake signal input and put the Vehicle Speed Sensor input to a switch that can be turned on and off. I put mine in the unused "blank" next to the "Trunk Opening Switch". I wanted to mount my switch before I took apart my dashboard so I bought another "blank". The Nissan part number is 68492-AX000. It cost less than $10 at a local dealer. I thought it might be nice to use a genuine "back door master switch" but that would require a mating connector and did I mention that it costs $275, yes I typed correctly, the stupid SPST 1A switch that disables the rear door costs $275. A little much don't you think?
How To Details
Go to the Photo Gallery section and look at my album. (Make sure you click "Sort by Name" so they are in order)
Nissan Murano Photo Gallery - MuranoLE10 Gallery
Assuming you are fairly mechanically inclined and can cut a wire, it is not that difficult to do. If, however, you don't know a phillips head from a slotted, don't attempt it. If you are careful, no one will even be able to tell you cut the wire as Nissan uses a wire bundle cover that can be opened and closed again. It is very sticky. One note, definitely put a thick towel down in front of the shift knob as the Nav unit is a sheet metal box and will surely scratch the plastic when you tilt it down.
I found the hardest part to be removing the "switch blank". There is a snap tab on the top and bottom and you have to jam something in there to pry them up so you can remove the blank. It came out but I sure didn't want to break the tabs off so I was very careful.
In photo 17, the Violet wire is the speed sensor. The green is the parking brake. I didn't take a picture but I put a self tapping ground screw in a piece of sheet metal under the dash for the ground for the parking brake.
I bought a DPST switch from Grainger part number 2TPK6 because they had it in stock but I didn't need the double pole because I grounded the parking brake signal all of the time. If you want not to do that you would need a DPDT because the signals are opposite. i.e. when the speed signal is open the parking brake needs to go to ground. (See the attached file circuit.pdf)