lexuslover

wow that sucks. i am sure someone will figure it out sooner or later.

if not, you always have the hardware hack (switch install), although that is much more invasive.

flipside909

The NAV override works fine in the pre production 2007 LS460 Lexus Marketing showed us earlier this year. But then again, the Gen 5 nav it had does not have the current software update back then.

Hip_hop77

You have to push upper left.. than lower left.. and repeat..

|mpulse

Yeah, looks like he's doing it right.
What's the headlight switch trick?

duckduck

I guess the only way to do a Nav "Override" would be to actually cut into the wires (Nav Hack) on the '07. Bummer

Bichon

Unforunately, the only electrical nav hack that does the same thing as the software overide is the one with a bad side effect: it makes the nav updates jumpy.

Mike_TX

Correct. And I'm assuming you're talking about putting a switch in the VSS circuit.

I did that on my Infiniti M45, and not only does it make it jumpy, it can lose your position entirely, causing you to have to stop to re-acquire it (which of course defeats the whole purpose, doesn't it?). All in all, not a good solution IMO.

Technique

From what I've read, the only reason the nav gets jumpy is because people did not properly perform the hack. If you ground and terminate everything cleanly and properly, there should be ZERO side effects from the nav hack.

Mike_TX

Well, the issue is that when you interrupt the signal from the VSS (vehicle speed sensor), the Nav has to reply primarily on the signal from the satellite, which updates only at certain intervals, hence the jumpiness.

OEM systems (at least MOST of them) seem to rely a bunch on inputs from the on-board yaw sensors, steering position sensor, and VSS to display location. Aftermarket systems, however, don't require all this stuff, and the Garmin units I've had (with no VSS, of course) display position smoothly. But I think they smooth it via their software.

When I cut the VSS in my Infiniti and installed a switch so I could program while moving, I experienced some really weird stuff. As an example, I was on an interstate last year on a trip, and switched on the "hack" to program in a destination. The highway curved off to the right after I switched it, and when I switched it back to normal, the Nav showed my vehicle to be about 3 miles to the left of the highway (it didn't register the righthand turn in the road). For 100 miles it showed me zooming along through fields and lakes and mountains, until I stopped for gas and it "caught up with itself".

Another time it just kept repeating "Proceed to the highlighted route" until I couldn't stand it anymore and stopped to let it find itself.

Unless the IS Nav hack is somehow able to bypass the Nav control unit itself and not bypass the DISPLAY , the display will be jumpy.
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Technique

What about the "Watching DVDs while the car is in motion" hack? I believe that is a different sensor and will NOT affect the nav in any way, correct?

mofogasm

you cut the speed wire and tap it to another wire which makes it so that the nav is not jumpy.

Technique

Posts in this thread and others seem to indicate that there is hack for the IS that results in a non-jumpy nav.

https://www.clublexus.com/forums/sho...highlight=hack

"There's another nav hack for the IS that's better than this one, where the speed sensor and display output circuits are disconnected from the nav unit but then spliced into the display unit's speed input. There is no switch required and it allows smooth map operation simultaneously with no speed lockouts."

Technique

Anyone else with an 07 and NAV tried the destination override sequence? I would be surprised if it's "gone" completely... More likely it's simply changed to something else...

Payam

But with the cutting of the wires, unless you want jumpy nav or install a switch,you are not going to be able to change your destinations in the '07 models...
Even people who have done the "Nav Hack" have to do the volume menu override in order to input destinations while in motion. The only way to get around that is to completely bypass the speed wire, which is where the jumpy nav comes into play.

Technique

Ah, this makes sense now... Well, hopefully someone will find a bypass sequence in the 07 model. If not, I'll just install a switch. But then again, it seems like the bypass takes maybe 10-15 seconds to perform, and this must be done each time you start the car. If that's the case, I will probably install a switch regardless...