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Navi safety override?

Posted: Mon May 09, 2011 5:57 pm
by ravi100
Has anyone figured out a way to disable the Navi system safety override that prevents you from using it while moving? I hate that feature when a passenger could easily operate the system but is not allowed to.

Re: Navi safety override?

Posted: Mon May 16, 2011 10:08 pm
by GroundLoop
I agree. I haven't dug into the pinouts in the service manual yet, but there might be a signal to the head unit that the car is in "Park", much like the one for Reverse. Hopefully that's not moved to CANbus.

There might be a wheel rotation signal that can be interrupted as well -- effectively making the nav think the car has stopped, until GPS convinces it otherwise.

Re: Navi safety override?

Posted: Mon May 16, 2011 10:16 pm
by palmermd
GroundLoop wrote:I agree. I haven't dug into the pinouts in the service manual yet, but there might be a signal to the head unit that the car is in "Park", much like the one for Reverse. Hopefully that's not moved to CANbus.

There might be a wheel rotation signal that can be interrupted as well -- effectively making the nav think the car has stopped, until GPS convinces it otherwise.
It is definitely not related to Park. It becomes enabled when you stop at a traffic light, and then disables again once you start moving. Not sure how the motion signal gets to the unit, but it is definitely motion related not gear selector/Park.

Re: Navi safety override?

Posted: Mon May 16, 2011 10:55 pm
by TomT
It uses the vehicle speed signal and disables above 5 MPH.
palmermd wrote: It is definitely not related to Park. It becomes enabled when you stop at a traffic light, and then disables again once you start moving. Not sure how the motion signal gets to the unit, but it is definitely motion related not gear selector/Park.

Re: Navi safety override?

Posted: Mon May 16, 2011 11:02 pm
by TEG
Is the vehicle speed signal a single wire that can be tapped into?

I found one on my wife's Highlander and put a switch inline so you can disable the signal while in motion and get temporary access to nav input. But the GPS gets a bit confused if you leave it off so you can't leave it disabled for long.

Re: Navi safety override?

Posted: Tue May 17, 2011 8:52 am
by DarkStar
TEG wrote:Is the vehicle speed signal a single wire that can be tapped into?

I found one on my wife's Highlander and put a switch inline so you can disable the signal while in motion and get temporary access to nav input. But the GPS gets a bit confused if you leave it off so you can't leave it disabled for long.
It's all in the CAN-bus, however maybe a false speed signal could be sent to the navigation system... Hmm...

Re: Navi safety override?

Posted: Fri May 27, 2011 10:06 pm
by GroundLoop
DarkStar wrote:It's all in the CAN-bus, however maybe a false speed signal could be sent to the navigation system... Hmm...
Nope, not on CANBus.. the Nav uses Pin 28(GR) to sense the wheel speed, and confirms/calibrates with GPS.

Try disconnecting 28. :)

Re: Navi safety override?

Posted: Sun Jun 05, 2011 11:44 am
by drmanny3
I definetly want to defeat this system. We did so on our 2005 Prius (required that you enter software diagnostics) Then in 2006 Toyota reversed engineered that method. Then a company introduced a plug in device that electronically says ok at the sign on screen and then temporarily stops the signal showing the car's movement. It allows the use of the screen for about 10 seconds and then lets go. You must wait another few seconds and then the screen comes back and you can continue to enter your destination. Toyota felt that one could use the voice activated system but it never really worked once you were driving. So I hope as our numbers pick up that someone out there will make a add on piece. As for the phone I was able to put a on off switch on one of the speed wires and that allows me to use the phone any time. I would imagine that will also be available on the leaf.
Manny

Re: Navi safety override?

Posted: Thu Mar 15, 2012 6:58 pm
by QueenBee
So has anyone tried this yet to see if the navigation also uses the GPS to detect movement?

Re: Navi safety override?

Posted: Thu Mar 15, 2012 7:11 pm
by LTLFTcomposite
They should at least AND that condition together with the weight sensor that disables the passenger airbag. Of course if the passenger seat is occupied you probably don't need the navigation system to tell you what to do.