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keydiver
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Re: Navi safety override?

Thu Mar 15, 2012 8:12 pm

Looks pretty simple, just like in my Prius hack:
Image
Pin #28 of the A/V unit comes from the speed sensor, so all you need to do is cut it, put in a switch, and you can fool the A/V into letting you access everything as if the car isn't moving. It also appears that I should be able to hack the camera's video input, just like my other Prius hack, except I don't think I could deal with the lines the display draws on the screen to show where I'm backing into. With the Prius its just a line at the bottom warning you about something.
Has anyone had the A/V unit out yet? Can you give some tips on removal, to get to pin #28? I'd do this tomorrow if I didn't have my plate so full of things already.
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TomT
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Re: Navi safety override?

Thu Mar 15, 2012 8:31 pm

I believe that you might find that you also have to disrupt the GPS antenna signal...
keydiver wrote:Looks pretty simple, just like in my Prius hack
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keydiver
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Re: Navi safety override?

Fri Mar 16, 2012 8:13 am

TomT wrote:I believe that you might find that you also have to disrupt the GPS antenna signal...
I'm betting NOT. Why would they make it so much more complex than they need to? They have a simple speed sensor to do the job of disabling access, and why clutter it up by also looking at the GPS?
I'm sure someone here has had the A/V unit out, or at least the dash parts around it. Any help?
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TomT
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Re: Navi safety override?

Fri Mar 16, 2012 9:29 am

Because the Nav/Display system uses the GPS to refine the speed data. Thus, if they coded it to simply look at the total corrected speed data to determine if the car is going faster than 5 mph, it may still see a viable speed signal even with the speed sensor data disrupted...
keydiver wrote:
TomT wrote:I believe that you might find that you also have to disrupt the GPS antenna signal...
I'm betting NOT. Why would they make it so much more complex than they need to? They have a simple speed sensor to do the job of disabling access, and why clutter it up by also looking at the GPS?
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keydiver
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Re: Navi safety override?

Fri Mar 16, 2012 1:34 pm

OK, to put all controvery aside, it works! Its a simple matter of cutting the gray/silver striped wire to pin #28. This not only allowed me to enter a new destination as I drove, but I could also access all of my cellphone options while driving. The only downside I could find was that as long as I had the speed sensor signal interupted, the NAV showed my car at the same location where I first threw the switch, so you only want to interupt the signal long enough to make the changes you need, and then reconnect the signal to let the NAV update your location. One VERY important note if you are going to attempt this: ignore the pin numbers molded onto the A/V plug. Not only does Nissan totally ignore those numbers, they assigned the new pin numbers BACKWARDS from the order shown on the plug, and with all odd pins on the top row and even numbers on the bottom, as shown on the datasheet from the manual above. The pin numbers above are looking at the back of the connector, with the wires sticking out toward you. The Gray/Silver striped wire you want to cut is the 4th wire from the left on the bottom row. Simply connect it to any SPST toggle switch, to open the connection when you want to access the grayed-out menus. I had this toggle switch in my junk box, so I dremeled out one of the extra switch blanks in the dash, and trimmed it in nicely with an Xacto knife.
Image
While I was at it, I decided to also try out my Prius "Anytime Backup Camera" mod, which also works perfect. You need to cut the Green/Silver reverse wire to pin #30, install a simple 1N400x series diode in series with the cut, with the banded cathode side toward the NAV. Then, I supplied +12 volts to pin #30 through my toggle switch, which I got from pin #31, a Purple/Silver wire, which forces the backup camera on at any time. In my Prius I used this to connect a Garmin GVN52 navigation unit to the display, since I didn't feel like spending the $3000 upgrade to get NAV in 2006. I have also used the video input to play movies while parked, but I don't know if I'll go to that extra trouble in the LEAF. I guess it could be useful if I was sitting for a few hours charging somewhere, but that's about all I can think of. I always wanted to install a large IR array out front on my Prius, and a camera, to see through the fog better, but never got around to it.
A couple notes on removal of the NAV, and running the wires:
1) The complete trim assembly around the NAV simply pops off, and then you lift up slightly to release a couple fingers in the dash. You need to unplug the emergency flasher switch to be able to lay it down out of the way.
2) The NAV itself is simply held in by 4 large Philips screws. remove them, pull it out, and unplug the large 40-pin plug on the driver's side.
3) To run the wires I dropped the panel above the driver's feet. It is held in by 2 plastic Philips screws, which only need 1-2 turns to release, and a large plastic nut on a stud on the firewall. This allowed me to grab the wires I fed in from the switch, and get them over closer to the NAV.
4) I stuck a small pole down a hole to the left of the NAV, which came out right above the accelerator pedal, so I could tape the wires to it and pull them up.
I don't think Daryll will mind, I hacked this picture off his site to show how the Anytime Backup Mod works:
Image
The diode keeps the backup lights from coming on whenever you throw the switch.
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TomT
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Re: Navi safety override?

Fri Mar 16, 2012 2:07 pm

It doesn't bother me enough for me to undertake all that is necessary to mod it, but it is good to know nonetheless. Nice job.
keydiver wrote:OK, to put all controvery aside, it works! Its a simple matter of cutting the gray/silver striped wire to pin #28.
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ebill3
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Re: Navi safety override?

Fri Mar 16, 2012 2:57 pm

Nice work - thanks for posting.

Bill
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garygid
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Re: Navi safety override?

Fri Mar 16, 2012 3:36 pm

So, on pin 28, if one supplied infrequent pulses
(what is the pulse rate at the "not moving" threshold?),
the Menus might work, AND
the GPS might still Track the car's position?
See SOC/GID-Meter and CAN-Do Info
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QueenBee
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Re: Navi safety override?

Fri Mar 16, 2012 4:20 pm

keydriver, wow, thanks for giving this a go!

I'm also working with a guy that has made kits for other Nissan cars that does the same thing. He's sending me a kit to test and if it works he'll make it available to everyone. It's a lot more expensive than DIY but it requires no cutting or wiring leaving the OEM wire harness intact. It connects inline to the OEM harness. Then there is a wireless remote to override the nav safety and to activate the backup camera. The mirror buttons could be programmed for this function. Also has a slightly cheaper version that uses normal switches. I'll let everyone know how it goes.

QueenBee
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Re: Navi safety override?

Wed Mar 21, 2012 6:56 pm

OK the kit worked great and installed easily. I can now activate the reverse camera and my passenger can use the navigation/etc. while the car is moving. Programmed the homelink buttons to operate these features.

If you leave the speed sensor disabled the GPS has trouble but doesn't take too long for it to catch up once you turn it back on.

He hasn't updated the website yet but this is the kit he sent me:
http://www.carkitcompany.com/nissan-mur ... remote-htm" onclick="window.open(this.href);return false;

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