Navigation Input Override (Speed Sensor Bypass)

Very true. But if you could keep the bursts frequent enough, like very second or so, chances are reasonably good that you'd still be going the same direction. If you had to accumulate several seconds worth though, you're very right - you could easily have turned 90 degrees and the burst could throw you further off instead of correcting.

 

While hacking the override is possible, I do not like the inaccuracy that is induced into the NAV system.

I'd rather see if we could convince Toyota to provide a software update that detects if a second person is sitting in the passenger seat, and if so, allow the NAV system to be accessed.

This is a reasonable request, and would be a much more elegant solution.

 

No doubt the best possible solution. I wish you luck with it and I'll be happy to sign your petition, but I won't hold my breath.

 

Persistence....

I was able to get Pioneer to add 'vicinity search' to their AVIC line. Of course, now I'm no longer using AVIC NAV systems.

 

Pretty close to what I was thinking of using - but I was considering using a 556 (dual timer) IC, one timer to provide the pulses and one as a timed switch, so to speak. A momentary switch would start one timer, which would in turn start the 2 MPH pulses - and then would return to normal operation after, say, 2-3 minutes (programmable). One momentary switchpress instead of two toggles. Also may be a a bit easier to find an attractive, small, round momentary swich to fit into one of the existing dash "plugs".

Glad to hear yours is working well - thanks hawkmoon!

 

I simply switched the violet sensor wire coming off the DVD on my 2006 prius and although the satellite nav takes over in about 2 min with its jerky "non- dead reckoning" fashion.... when the switch is engaged, I still maintain full access to my nav inputs and controls. Once I switch the switch back to normal the dead reckoning takes hold again and all is well.

I don't have bluetooth in this switch.. only nav.. but I just wanted to let you know.. I do not have to keep switching the switch on and off because something resets... as long as the switch is engaged, I have function controls and like I said, if left engaged, the nav takes over with satellite only and its very jerky and inaccurate until dead reckoning is restored when the switch is restored to normal.

I don't know if the 2010 will respond this way or not.. I haven't modded mine yet.

 

Well your instructions were great.. I appreciate the detail in your descriptions.....

Let us know when your ready to market it.... I think "allot" of us are interested, but want the simplest fix that will work..... the more plug and play you can make it, the more I'd pay.

Question... I accessed that wire at my DVD which only gave me function over the nav but the phone and bluetooth was still locked out..

It is possible to do the same for those of us who mainly want the nav and don't care to try and take apart our console?

 

I installed a basic switch last night and mine responds the same as hawkmoon's - about 30 sec until lockout. You can cycle the switch as many times as you want, and it will return to normal operation as long as it hasn't been without the speed signal for more than 30 sec and it hasn't locked you out. Once it locks out, even if I cycle the switch, it seems to need another 30 second cycle (a GPS "update") with the speed signal present before it allows you to "unlock" again. Interesting.

I'll be implementing a timer circuit similar to hawkmoon's, with both a "timed" (auto-return to normal operation) and Toggle-switch mode. I believe I'll use a three-position "momentary-off-on" toggle switch on the plug just below and to the right of the power button, which I believe is for a Parking Assist feature that I don't have.

Hawkmoon, thanks again for the great info and instructions. Really helpful!!

 

+1

 

+1

 

So here's an interesting new data point on the NAV hacking subject:

http://priuschat.com/forums/gen-iii...head-unit-their-2010-prius-ii.html#post941578

Seems the Toyota NAV unit is made by Fujitsu Ten, who also makes the Eclipse NAV head units. And I determined this evening that an Eclipse map DVD will in fact load and work in the Toyota NAV system. So far, that hasn't gotten me any closer to actually unlocking the NAV while in motion, but I feel like it's a good data point toward the hoped for software solution. I sure wish I was the software type... I know this thing can be hacked pretty easily by someone who does that sort of thing.

 

This may be an ignorant question but I have to ask anyway. Is there any chance that there might be map upgrades for the Eclipse that would work in our units? hopefully for less money than Toyota charges.

EDIT: Ah, never mind I see you are working on that possibility, I should have read the other thread before I ask. Good luck with the project.

 

I wondered the same thing, which is why I ran the test. But it turns out the Eclipse DVDs are actually more expensive than the Toyota ones and don't even seem to have as good data. Can't imagine why anyone would actually choose to install a DVD type NAV if they had a choice in the matter, but that's a rant for another day. Anyway, yes you can do it and no, you probably don't want to (unless the Eclipse DVDs get a LOT less expensive).

 

Thanks Rachael, it was a good thought anyway.

 

Not sure if anyone has tried this - but Lexus had the over-ride for service technicians... It can likely be done in programming also (I'm getting my programming system in the next few days - that's another topic).

For the Lexus (and Toyota), you access the menu by pressing "MENU", "VOLUME", then at the volume screen you press:
the top left corner
The bottom left corner
the top left corner
The bottom left corner
the top left corner
The bottom left corner

And bingo - service mode.... You can then press "override" for 3 secs, and the NAV will work for your whole drive...

I don't have the Nav, so I can't comment further...

 

Unfortunately it does not work on the Australian Gen 3 Prius.

 

I found this video by htmlspinnr posted in another thread, and it goes through a similar method to access the function check/setting menu (in this case to adjust the BT mic volume): [ame=http://www.youtube.com/watch?v=-gwQpvpYVYg&feature=channel_page]YouTube - 2010 Toyota Prius Bluetooth microphone volume adjustment[/ame]

It looks like it has submenus for the GPS and sensors. I was wondering if anyone has tried it?

 

Just joining this chat group and this thread (in fact joined because I wanted to solve this Nav disable problem). With my experience with external GPS units (a TomTom), I was surprised that Toyota didn't at least allow use of Nav buttons when the passenger seat was occupied (my 2007 Honda lets you use all the keys, all the time). I mean, you're on a long trip on the interstate to visit nana, getting hungry, want to see what food joints are up ahead and Toyota wants you to stop the vehicle to look up POI's? I assume that your future post(s) will outline how to make this mod. THANK YOU for your hard work and bravery (I don't even like insects to hit my new car, let alone pulling it apart and cutting wires!!).