Is This Conceptually True

[AndySpill]

Pardon my simple attached diagram.

Is it true, conceptually that the Secure Gateway, be it the factory one, or in its place an ECRI device or an unmarried but connected Z Automotive Tazer, determines what things your OBD 2 plug in device can do on your JL?

It's my understand that the factory SGW limits your ODB 2 plug in device to read only, while the other two devices (again when it come to the JL Tazer it needs to be unmarried and connected) open up the ability to set certain attributes of the vehicle.

...just trying to understand this topic, which I'm really new to and confused by.

TIA

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[jludave]

Is it true, conceptually that the Secure Gateway, be it the factory one, or in its place an ECRI device or an unmarried but connected Z Automotive Tazer, determines what things your OBD 2 plug in device can do on your JL.

Yes, true.

It's my understand that the factory SGW limits your ODB 2 plug in device to read only, while the other two devices (again when it come to the JL Tazer it needs to be unmarried and connected) open up the ability to set certain attributes of the vehicle.

You're understanding is correct.

The SGW is exactly what it sounds like - a secure gateway. A SGW bypass module (Tazer, ECRI, etc.) is also exactly what it sounds like - it bypasses the secure gateway.


The SGW in short is a module whose function is simply to keep the vehicle's communication networks secure. The SGW protects the vehicle networks from being exploited by creating a firewall between two portions of the network with the most vulnerability. These are the telematics/radio units and the Data Link Connector (DLC), better known as the OBD2 port.

So how does the SGW work? It separates the vehicle network into private and public sectors. The public sector includes the telematics unit and the DLC. Everything else on the network is considered private.

Without authorized access, or a bypass module, devices will be allowed read-only or passive access to the private network. Passive means the ability to read codes, and data but does not include the ability to clear DTCs perform, actuator tests, special functions, ECU configuration, flashing, or module resets. At least on the private side of the network.

 

[rdfact]

When you have a Tazer, you unplug the SGW and put the Tazer in place. Does that mean your Jeep is now less secure?

 

[jludave]

Does that mean your Jeep is now less secure?

Theoretically, yes. But who is going to know that you have a Tazer installed? And, who is going to try to “hack” your vehicle? If someone wants your vehicle bad enough, it will simply be stolen.

Many, many people run with a Tazer installed with zero concern or issue.

 

[AndySpill]

Would you please explain Dave @jludave the underlying principles of why the vehicle is less secure, even if it's only slightly so, with an aftermarket gateway like an ECRI or unmarried JL Tazer? I would presume its more hackable remotely...?

I say this because if getting physical access to the vehicle is doable one could disconnect the 8 and 12 pin cables from the factory SGW and plug in instead an ECRI or JL Tazer, no?

 

[jludave]

Would you please explain Dave @jludave the underlying principles of why the vehicle is less secure, even if it's only slightly so, with an aftermarket gateway like an ECRI or unmarried JL Tazer?

You are bypassing the SGW. The Tazer and ECRI are not gateways as you mention. They are gateway bypass modules.

I would presume it’s more hackable remotely...?

In theory, yes, but what are the odds? Who’s going to know you have a bypass module of some sort installed.

I say this because if getting physical access to the vehicle is doable one could disconnect the 8 and 12 pin cables from the factory SGW and plug in instead an ECRI or JL Tazer, no?

Yes. And then? They’d be able to do the exact same things you could do. Again, who’s going to actually do this? If a thief wants your vehicle, they are not going to take their time messing with any of that.

I know you’re asking questions to learn, but your fears about bypassing the SGW should be quelled by the fact that many people run with Tazers or other such devices 24/7.

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