Disabling Nav Greying out in motion feature

josborne said:

The link provided did not take me anywhere that explained how to disable the motion sensor.

Click to expand...

Here's an excerpt from the link. Perhaps you have to be a registered PriusChat member to view it, I don't know...

(Note: There a lot more info, including pictures after the jump)

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How to Install a Navigation System Defeat Switch

Temporarily disable the speed sensor and thus allow a passenger to enter navigation instructions while the vehicle remains in motion
How To: 2004 Prius Navigation System Speed Sensor Defeat Switch

*Disclaimer:The modification below is taken at your own risk. It could result in damage to your vehicle. You could be injured or killed doing the modification. It could void your warranty. It could result in injuries if the Navigation system is used other than in the way it was designed. Neither the author, Evan Fusco, MD nor PriusChat.com nor anyone affiliated will be held responsible for injuries or damage resulting from any of the modifications. If you choose to make these alterations to your vehicle you do so under your own risk and responsibility. The information here is provided for informational purposes only and it is not suggested or advised that you carry them out.

What:
These instructions are for the installation of a switch in the 2004 model Toyota Prius which is equipped with the factory installed DVD Navigation system. The switch allows the occupants of the vehicle to temporarily disable the speed sensing system.





Click for full image

The speed sensing system has two functions:

1) It enables the 'dead-reckoning' system which allows the vehicle icon to move smoothly on the MAP screen and may also assist the system in making the driver aware of turn and navigation instructions in the most efficient manner.

2)It tells the Navigation computer when the car is in motion and disables direct address entry and other navigation search features as a safety tool to prevent the driver from attempting to use these distracting functions while the vehicle is in motion.

The author feels that there are many times when it is desirable to have the Navigation system fully enabled while the vehicle is in motion. In particular when there is a front seat passenger who is able to make those entries in the computer while the driver's full attention is on the road and driving.

By using this speed sensor defeat switch the passenger can temporarily disable the dead reckoning, which is unnecessary when entering navigation information anyway. Once the information has been entered successfully the switch is returned to the normal position and the system will work normally.

After 30 seconds to 1 minute after deactivating the speed sensor the navigation system will detect, via the GPS feedback, that the vehicle is in motion. This will generate an error code and then disable access to the navigation buttons again. It is necessary to flip the switch momentarily then flip it back to regain access to complete your entries.

This modification does NOT disable the speed sensing for the Bluetooth® Phone system.

Required Items:

10mm Socket wrench with extension if possible
Phillips head screw driver
20 or 22 gauge wire
Soldering Iron and solder
Drill with 3/4" bit (if using suggested rocker switch--bit size may vary otherwise)
Radio Shack SPST Rocker Switch (Part # 275-693) or Radio Shack Momentary Pushbutton Normally Closed (NC) Switch Part # 275-1548)

Click for full image
Wire cutter
Wire stripper
Electrical tape

Time and Difficulty:

The entire process took the author about 1 1/2 hours. I'm not an experienced electrical person, don't do my own radio installations, but am relatively handy and confident with tools. The instructions will lay out the process in a very simple fashion and it is not complicated, but you must work in a confined space and around other important wires which could be damaged unless care is taken.

Process in Brief:

1. Look under driver's seat for purple wire in the rightmost connector. Note size and color of violet wire so you can identify it elsewhere.
2. Remove Arm Rest.
3. Re-identify violet wire where it runs just under the edge of the carpet under the arm rest. Unwrap as much black tape as possible to expose wire and cut at midpoint and solder a 1 foot long extension to each end.
4. Thread wires to switch site and replace armrest.
5. Drill hole in armrest where switch is desired but won't interfere with cup holders, etc.
6. Cut wires to appropriate length and install and solder wires to switch.
7. Test