Security bypass cable question

[Wabujitsu]

My problem is I'm an IT guy, trying to think of it in traditional computer network terms, and of course canbus or whatever other bus they're using can and probably does work completely differently, and there's no reason the gateway can't both be bridging the secure to insecure network, but also disconnecting it not isolate any modules

Is it possible that it doesn’t bridge any internal networks, but instead is a gatekeeper to all of the vehicle’s networks, from any external input from the OBDII port and the head unit? Those are the only two ways ANY code can be introduced into the system, right?

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[mixdup]

Is it possible that it doesn’t bridge any internal networks, but instead is a gatekeeper to all of the vehicle’s networks, from any external input from the OBDII port and the head unit? Those are the only two ways ANY code can be introduced into the system, right?

Sure, it could just be independently connected to the two sides of the network, or a gateway (hey, what do you know) through which the OBD connects to the network. But, the gateway bit seems a little off because with a 12+8 cable, you're connecting an OBD adapter directly to both sides. Maybe the difference is handled in JScan. I simply don't know enough here

 

[Wabujitsu]

Sure, it could just be independently connected to the two sides of the network, or a gateway (hey, what do you know) through which the OBD connects to the network. But, the gateway bit seems a little off because with a 12+8 cable, you're connecting an OBD adapter directly to both sides. Maybe the difference is handled in JScan. I simply don't know enough here

This might answer your questions; it’s a bit over my head. https://www.jlwranglerforums.com/forum/threads/odb-2-ports-and-sgw-for-dummies.127328/#post-2665988

 

[THAW]

I’m curious about that too. When I unmarry my Tazer, does the tire size revert back to stock? If I don’t unmarry it and just remove it, does it retain the Tazer tire size?

Yes, tire size changed with a Tazer will revert back to stock when the Tazer is unmarried. And, yes, tire size change will be retained if the Tazer is removed without being unmarried.

 

[Wabujitsu]

Yes, tire size changed with a Tazer will revert back to stock when the Tazer is unmarried. And, yes, tire size change will be retained if the Tazer is removed without being unmarried.

Thank you, Foster.

 

[mixdup]

This might answer your questions; it’s a bit over my head. https://www.jlwranglerforums.com/forum/threads/odb-2-ports-and-sgw-for-dummies.127328/#post-2665988

That's actually very enlightening, and has actually convinced me to get the SGW extension cables, but keep the SGW connected when I'm not actively changing anything (since I'm using JScan and not buying a tazer that is designed to stay connected all the time, and also won't have the tazer bypass module which I suspect is just ferrying messages across without checking/validating authentication)

It's probably perfectly fine to run disconnected all the time, but it does really seem like the SGW is a bridge between the two sides of the network

 

[AndySpill]

@mixdup

I think there's been some really good advice from knowledgeable people here but some of it is a bit technical and perhaps tangential to your original question, subsequently clarified (that's if I understand it and haven't myself gone off into the weeds.)

You've got a Wifi ODB2 reader and you plug it into a 12 + 8 cable, where the other end of that cable plugs into the Security Gateway (SGW) after you first disconnected the factory plugs that where in there, in order for you to use Jscan.

In this scenario you will need to yank that 12+8 cable from the SGW when you're done "Jscaning," and re-plug in those factory cables into the SGW or else, as mentioned, you'll lose your radio.

Now, will the SGW extension cable make that easier, sure. And if you have plugged into the SGW, or that SGW extension cord, a JL Tazer or ECRI etc. it seems that the Wifi ODB2 connector can go right into the vehicle's ODB2 port, but that doesn't sound like your situation.

Of course it may be me here that has this wrong, the aforementioned SGW for Dummies thread being mine and this not being an area of expertise for me; just one I hope to provide specific and easier to understand clarity to your O.P. question on.

 

[mixdup]

In this scenario you will need to yank that 12+8 cable from the SGW when you're done "Jscaning," and re-plug in those factory cables into the SGW or else, as mentioned, you'll lose your radio.

Yeah, I think the initial advice that I could just leave it disconnected was not wrong but also not totally right given what I wanted to accomplish (everything works exactly the same as with the SGW in place). I drove it one day without the SGW and things were working, but I just drove to the doctor and listened to the radio. I didn't do anything that would've really tripped up the radio interfacing with the rest of the Jeep like opening Off Road Pages or anything

I don't plan to be fiddling a lot with stuff, and won't need to extract real-time info so I'll probably just get the extension, put the SGW back in the loop and disconnect when I need to tweak something. I don't need Tazer-only functionality nor am I going to be extracting OBD data for some other dashboard on my phone/tablet/etc so it's not worth buying a tazer bypass module

Thanks for all the info to everyone participating in this thread, it has been very educational and very fascinating for this IT/network guy

 

[AndySpill]

@mixdup

 

[TrailMax]

@mixdup

I was wondering if I was missing something, thinking that I just used the extensions to hook up a ODBII Reader to use JScan to change settings without using all of my more colorful words trying to reach all the way up into the dash to plug the cables into the SGW.

 

[AndySpill]

I was wondering if I was missing something, thinking that I just used the extensions to hook up a ODBII Reader to use JScan to change settings without using all of my more colorful words trying to reach all the way up into the dash to plug the cables into the SGW.

Nope. Just as you couldn't use just an ODB 2 reader with Jscan alone, without other gizmos like an ECRI or JL Tazer, without a 12 + 8 cable, nothing about the SGW extension cord alone will provide you with any additional functionality.

This is because the SGW extension is just that: an extension cord that provides nothing alone but convenience of access to the 12 and 8 pin hard to reach connectors.

By analogy, I have some electrical outlets in my home's basement with extension cords plugged into them because wood pellets that heat in winter get stacked in front of those outlets and block access to them, even though I may need to tap them to power appliances.

The SGW extension cord is in this analogy no different that the electrical extension cord I just mentioned that I picked up at the big box store

 

[THAW]

....you couldn't use just an ODB 2 reader with Jscan alone, without other gizmos like an ECRI or JL Tazer, without a 12 + 8 cable...

JScan can be used without bypassing the SGW; a bypass is required only for changing settings and clearing codes.

 

[AndySpill]

JScan can be used without bypassing the SGW; a bypass is required only for changing settings and clearing codes.

Ok...

I think once I used Jscan to read diagnostic codes; all other times it was to change settings...

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