Bluetooth while moving

I was wondering if anyone has any schematics of the MFD boards or anything like that. I do not have the service manuals so I don't know if these even exist. The mod of cutting the violet (speed) wire or putting in a switch, or using a lockpick is well documented on here. I found an older post which provided a circuit to intercept the "on-hook" and "off-hook" switches on the steering wheel and essentially flip the switch(break the violet wire) for you (which seems to be the coolest solution I have found). BUT my thought is if we had some idea of what was going on in the MFD then maybe we could see where this speed wire goes. For example if the violet wire connects via the connector on the back of the MFD then branches to different circuits then perhaps you could simply cut the trace on the MFD that goes to the bluetooth circuit and not affect the "5 minutes bars"?!?

 

Is it possible that this speed information is packeted digitally and then sent on the LAN to each component (the FE display components, radio to turn off the song scrolling, the bluetooth to disable... well, everything)? In absence of a better solution I may have to go for the cutting of the speed wire solution. But I can't help but think that there has got to be a way to interrupt this speed information to only the bluetooth. Given enough information there has to be a way.

 

I guess I'll put down on my list of wants "The Prius Service Manuals" and have a look. Not sure if there would be any schematics of the MFD circuit boards though.

 

O.k. so I got onto TIS to get the service manuals... Over 500 documents that must be downloaded manually, BS! Just give me one service manual in pdf form I can download, but no! The service manuals are totally useless anyway, they provide basic wiring diagrams but they are in module form. So they just say ECU and show you wires going in and out, MFD wires in and out. There are not schematics of any boards or anything technical about them whatsoever! Plus the repair manual chapters are in the moronic form or Microsoft help documents, did this work? then turn of radio, did that work? It's like the manuals were written for Pre-Schoolers.

O.k. enough griping, I did NOT find the override to the bluetooth speed wire problem YET. I am thinking I will have to take apart the MFD and trace through the circuits. OH, and they do not even mention the bluetoooth circuit, nothing to do with any portion of it except to show you where the Microphone is mounted and do not even give you any schematics on the amp or anything. O.k. now that's enough griping. But if you want usefull information do not waste your time with the TIS site or it's info.

Anywayz, the actual reason I posted this is to warn everyone. One thing I notice in tracing the wiring diagram is the VSC. Any of you that implemented the previous mod of simply cutting or switching the speed wire might want to think twice about using it. From what I could see in their horrible diagrams the VSC gets it's speed info from the MFD speed wire (that you cut). Using the previous mod might in fact disable the VSC since it doesn't know when your tires are spinning (or slipping). A toyota tech might want to chime in on this, but this is what I derived from their substandard information on the TIS site.