Speed sensor defeat - a modified approach

Thanks.

I every schematic that I can recall ever reading (including Honda), the standard was:

B, Bk, or Blk for Black
Br for BRown
Bu BlUe​

So a Blue wire with a Black stripe would be:

Bu/Blk​

I suspect "Blue" is the correct answer, because 22 of the 28 wires on the Harness from AutoHarnessHouse are black. the rest are:

- Red (two wires)
- White (one wire)
- Gray (one wire)
- Green (one wire)
- Blue (one wire)
​

There is no pin 1 mark that I can find on the AutoHarnessHouse harness. However, if I assume one of the black wires on one corner is pin 1 (with a red wire in the pin 2 position), then pin 17's wire is the Blue wire. When it stops sleeting, I will try lining up the Harness from the car to the AutoHarnessHouse harness. I should be able to verify pin 1 as ignition on 12 volts.

 

Never heard of that Lockpick device. Looking on the coastaletech website, I found speedlock overrides for non-Toyota vehicles. CoastalTech products are pricey.

COASTALETECH​

The PriusChat store has a SLO for about $100, but requires that you mount an on/off switch on your dash. The one I am working on is based on the work of another PC member: @MrZap. Mine activates the override by pressing either the "On Hook" or "Off Hook" buttons on the steering wheel for 3 seconds. It would then automatically shut off the override after 3 minutes. And I am hoping to sell them for $75, if I can keep the parts cost down.

I seriously doubt that Toyota would have a backdoor "manual diagnostic code" to disable the speed lock. Toyota is way too scared of someone getting into a crash, and suing them.

 

You can cheat by looking in the Electrical Wiring Diagram, which is in color, so you can pick any old "L" wire and see that it is in fact drawn in blue.

I think I remember some other manufacturer's diagrams where black was K. Anyway, it's just a matter of getting the hang of whatever Toyota's conventions are if you're working on a Toyota, and so on.

 

it’s a $100 device and takes a couple of minutes to install by merely plugging in a bypass cable at the navigation box under the drivers seat.

the hidden service screen and device installation details are here
https://www.coastaletech.com/media/LOCKPICK%201B%20v.2%20Instructions.pdf

 

Also see this video on Nav screen

 

That video is a really old Prius. There is no "menu" button or "Volume setup" screen on my 2016 head unit. I suspect a similar menu exists on the 2016 Head Unit. I strongly suspect that "Override" is no longer contained in Gen3 or Gen4 menu systems (Gen3 is 2010 and later). Toyota has not recovered from the "Unintended Acceleration" lawsuit in the early 2000's, and I am assuming they would have removed an override.

If you look at 4-runner, Tundra and Toyota nation sites, there are many threads on how to make a device to interrupt the speed signal coming into the Head Unit. You can't simply cut the speed wire, and pretend the car is always stopped. The GPS will detect the car is actually moving, and lock everything out again. I think Toyota did this to prevent such a simple workaround from working. The trick is to simulate moving at 1Mph, which keeps the GPS happy, but is slow enough that the Speed Lock does not kick in. You don't want to leave the "Override" on all the time either. The GPS uses "Dead Reckoning" for when you are in a city with tall buildings. Not having an accurate speed and turn data from the car will mess up your current location displayed on the screen after a while.

I guess I am not too surprised that a company like COASTALETECH made one of these devices. Not sure if the their system is sophisticated enough to simulate the 1 Mph speed on a Prius Gen3 or later. If you find one that works on a Gen3 Prius V, post a link.

 

yes, this is the Gen2 Prius forum, aka the really old Prius forum. You can feel free to search elsewhere for gen3 info

 

So gromittoo, how did it work out?
You were wise to buy the wiring adapter I would say, Everything else go to plan?
The Digispark does have an LED on the output pin already which helped me trouble shoot what was being sent out for a speed signal and that was enough for me to figure out when I didn't have things quite right.
Photos?