BMS Update?

[JodyS21]

Oh, yes. That side of things is very complex, and in Tesla cars involves a lot of specialised hardware. I saw a YouTube video on it some months ago, and it was fascinating. They were given a 100W power limit by Elon, which was a tough design limit. Worth digging up if you're interested. They may recently have changed the hardware again.

I have no idea where the MG Pilot is implemented, or what hardware is involved. On the Slack group, three ECUs have been obtained and examined. I'm interested in examining the firmware, but the encryption hasn't been determined yet.

One MG owner in Australia who also owns a Tesla model 3 says that the MG detection of speed limit signs is better in the MG. That may be partly because the Teslas get more training in the US, which doesn't use international standard speed signs.

Sat Nav map data is of course very large (11 GB for the Hyundai Kona), and would live on an off-chip flash drive.

It's amazing really, the computer processing power they can get into a car, I think of it as the tesla super computer!

Do you think there's any chance of someone breaking the security to fully access the ECU firmware? I'm assuming its using decent modern encryption.

 

[Coulomb]

Do you think there's any chance of someone breaking the security to fully access the ECU firmware? I'm assuming its using decent modern encryption.

It depends on how it's implemented. Other cars (e.g. Mitsubishi) have been cracked, at least partly (e.g. "codings", which is not executable firmware).

The firmware has to get decrypted at some point, so it seems to me that there is a reasonable chance it can be accessed. Though perhaps one day (maybe even now for all I know), the microcontrollers themselves will do the decrypting internally, using a key that is written securely at the car factory. If that is or becomes the case, then you are basically down to a human leak being the only real possibility.

I wish I had more time to look into this.

 

[Kithmo]

One of the reasons I never leave anything Bluetooth plugged into the OBDII port is that some of the cars ECUs could be accessed via that.
(another reason is because it sets off the alarm )

 

[Coulomb]

(another reason is because it sets off the alarm

It does? Darn, that UK body ECU is twitchy! I leave a dongle plugged into my Australian ZS EV without any alarm going off.

Now that you mention it though, there could well be a security issue.

 

[JodyS21]

It does? Darn, that UK body ECU is twitchy! I leave a dongle plugged into my Australian ZS EV without any alarm going off.

Now that you mention it though, there could well be a security issue.

It is thought that if you request data from a certain ECU it triggers the alarm, for security reasons I presume. I can't remember which ECU it was.

 

[Coulomb]

if you request data from a certain ECU it triggers the alarm... I can't remember which ECU it was.

That would be the body ECU, BCM. But just leaving the OBD2 connected would not request any data. Ah, unless you leave an app running, I guess. I think that most of the apps tiptoe around the body ECU (except for getting its firmware version), for that reason.

 

[JodyS21]

That would be the body ECU, BCM. But just leaving the OBD2 connected would not request any data. Ah, unless you leave an app running, I guess. I think that most of the apps tiptoe around the body ECU (except for getting its firmware version), for that reason.

That's it spot on, I think it is the thai app running when inside the house etc connecting to the car outside that's trigger peoples alarms (it's what happened once in my case).