Safe to disconnect new 12V (15.5V) Lithium Ion battery for OBDII Harness?

[ev_go123]

Another link to a service manual showing an OBD connector on a Model 3 in the driver footwell. (this one says APAC only, but that may predate 2020)

Tesla MODEL 3 SERVICE MANUAL: COVER - FOOTWELL - DRIVER (REMOVE AND REPLACE)

www.reichwein.it

Not sure how to remove the clips (they look like some sort of plastic rivet?)

Oh wow, didn't know someone was hosting this manual, that's very helpful (wonder if tesla will issue a take down on it).

I'll check out the cover on my 2022 M3 when I get a chance to see if it's got the connector.

 

[TomT]

Pretty sure the OBD connector will not give you access to anything except an unswitched 12v power source. I think you need to connect to the CAN bus for things like Scan My Tesla

The schematic shows that the CAN bus is on that connector...

 

[ATPMSD]

The schematic shows that the CAN bus is on that connector...

Yep, see post #20.

 

[Willy’sEV]

Why do this? You have a new car. If it aint broke don’t fix it.

 

[TomT]

Why do this? You have a new car. If it aint broke don’t fix it.

Because, via the Scan My Tesla app, it lets you monitor a plethora of data that you otherwise have no access to.

 

[TomT]

...if it exists!

[I'm looking into this because I'm thinking of buying a HUDWAY Drive Tesla version, and don't want to have to run wires to the 12V accessory socket!]

It exists on my 3 and it works! Easy peasy! Scan My Tesla is now a happy clam!

 

[Graham J]

How can we tell which flavour of battery we have?

 

[android04]

No Model 3s have OBD ports except the ones sold in China (or other Asian countries). But you don't need an OBD port to tap into the CAN bus.

 

[pbar]

It exists on my 3 and it works! Easy peasy! Scan My Tesla is now a happy clam!

To clarify, are you saying that there was a hidden OBD-II port on your US spec Model3 (what year?)

 

[pbar]

To clarify, are you saying that there was a hidden OBD-II port on your US spec Model3 (what year?)

I just checked on my 2021 M3P and there is no OBD-II connector behind the driver footwell cover :-(

 

[Willy’sEV]

Sounds like a good way to void your warranty.

 

[TomT]

To clarify, are you saying that there was a hidden OBD-II port on your US spec Model3 (what year?)

Yes, it is a March 2022 build.

 

[m a x i m u s]

OK, so I am going to disconnect the 12v and HV so I can swap out my steering wheel without fear of getting a faceful of airbag. After reading this thread, safe to assume that disconnecting power doesn't cause the car to lose memory settings, etc? I don't think it does, but just making sure before I dive in.

 

[Willy’sEV]

If you swop out the steering wheel aren’t you losing the center airbag?
I am no safety expert, but isn’t the center airbag on the steering wheel there for a reason?

 

[m a x i m u s]

If you swop out the steering wheel aren’t you losing the center airbag?
I am no safety expert, but isn’t the center airbag on the steering wheel there for a reason?

Added weight. JK. No, what I said was I am swapping the steering wheel for another one, which requires removing the airbag module to get to the bolt that holds the steering wheel on. I didn't say I was permanently getting rid of my airbag.

 

[Willy’sEV]

Added weight. JK. No, what I said was I am swapping the steering wheel for another one, which requires removing the airbag module to get to the bolt that holds the steering wheel on. I didn't say I was permanently getting rid of my airbag.

Perhaps the steering wheel looks nicer in your opinion, but aren’t you setting yourself up for voiding your warranty?
I can image what Tesla service will say when they see that wheel. Good luck.