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I just wired up my detector today to the OBDII port in the foot well. Yellow and black wire, just taped into them and ran the wire up the A-pillar so I did not use a connector and the connection is hidden behind the paniel. volt meter showed it turned off when the doors shut and no one is inside seated. no errors reported. Don’t be fooled, if you sit inside and close the doors it will stay on and that might make you think it’s not switched. I turned on sentry mode and watched through the window and it looked to be off.
HankLloydRight
No Roads
I'm certain the actual OBDII port is unswitched in Model S/X. I think you may have tapped a different wire or don't have accurate results with your voltmeter.
I've sold dozens of my PWS (see sig link) for MS/MX all connected to the OBDII port as they are "always on" devices and the OBDII port is definitely unswitched.
What year/model do you have?
I've sold dozens of my PWS (see sig link) for MS/MX all connected to the OBDII port as they are "always on" devices and the OBDII port is definitely unswitched.
What year/model do you have?
goRt
Active Member
In my p100d there was switched and perm in the obd - I used to run my dashcam from it
Mine is a 2021 model s plaid. It seems to be switch as far as I can tell. My meter is correct as I am an electronics engineer for the last 35 years and spent 10 years design stuff for AEM. Not that i haven’t missed things before but it’s unlikely. The detector turns off as it should when I am out of the car and doors are closed. I believe it was pin-1 on the connector. This is my first Tesla though.
israndy
Supercharger Hunter
You can check out EVERYTHING you can learn from your Tesla's can bus at GitHub - joshwardell/model3dbc: DBC file for Tesla Model 3 CAN messages
scottf200
Well-Known Member
See the section titled CANBus DBC Files and Similar on the first post of this thread.
Keep in mind that DBC files are model, year and firmware specific. Some 3/Y use that version. 2022 S/X use something similar. For pre 2022 S/X see that CANBus DBC Files and Similar section for earlier DBC files.
scottf200
Well-Known Member
From another thread (SMT) on other cable sources. I was looking for a 2022 TMY for one of my kids future delivery.
EVoffer now offers a cable for palladium 2021 S/X cars, as well as the new can connectors hidden in 2021 3/Y, and it does support multiple busses with canserver too!
Model S/X CAN Diagnostic Cable (For 2021+ Model)
This harness allow you to diagnose Tesla CAN signals through the CAN interface. You can use the harness to connect different OBD-II tools such as OBDLink MX+ and CANserver. Applications that can be used include ScanMyTesla, tesLAX, TM-Spy and CANdash. Both Vehicle CAN and Chassis CAN can be...evoffer.com
ScanMyTesla / CANserver users:
FYI, EVoffer added a page for the Y/3. The picture on that page will be updated when they have the new cable. Past EVoffer comment: "We have found a power source nearby. We will add a pair of connector{s} for powering up the OBD device"
>>>>
Model 3 2021+
Model Y 2021+
- Made in USA built after 2020/10/05; or
- Made in China built after 2020/12/28
<<<<
- Made in USA built after 2021/01/13; or
- Made in China built after 2020/12/14
Model 3/Y CAN Diagnostic Cable (For 2021+ Model)
This harness allow you to diagnose Tesla CAN signals through the CAN interface. You can use the harness to connect different OBD-II tools such as OBDLink MX+ and CANserver. Applications that can be used include ScanMyTesla, tesLAX, TM-Spy, CANdash. Both Vehicle CAN and Chassis CAN can be...
airborne spoon
Active Member
So perhaps I'm just blind but i cant seem to find the parts or wiring diagram for a 2021 model 3. I built an adapter cable some time back for my car and it works great on SMT but i want to make on for my friends car but i seem to be going full retard and cant find the diagram of what wire connects to what wire and the plug i need to get. I know mouser sold me the connector and pins for my model S one but i know the 3 is different. I like to build my own stuff instead of buy one whenever its possible.
YieldFarmer
Analytic.eth
What are you trying to connect to? Wiring diagram requires paying tesla $30 or so.
Connector info here: MCU Connector Information – Analytic.lol Feel free to DM.
airborne spoon
Active Member
Pretty cool link but I'm referring to the diag port oen, on my car it's the unused plug under the MCU. And someone posted a diagram on here somewhere of what line goes to what line on the OBD2 port. I need that except for a 2021 Model 3.
YieldFarmer
Analytic.eth
You mean the new blue CAN connector to the right/below the MCU/ICE ? I think that is the most recent one mentioned here - Diagnostic Port and Data Access
There is no OBDII interface though - You can use a special app though along with a CAN to OBDII intercept to read that data if you'd like
airborne spoon
Active Member
Yeah what I'm looking for is the exact same thing i have for my car (14 S P85D) that has a CAN plug on one side an an OBD2 plug on the other side that a Bluetooth OBD2 reader plugs into so i can use scan my tesla on my phone. except i need the pinout for a newer model 3
YieldFarmer
Analytic.eth
You need something like this which bridges the connection under/behind the center console, unless you're building a custom solution in which case you can grab the wiring diagram from Tesla for $30 OHP OBD2 Adapter Splitter for Tesla Model 3 & Y | 2019 - 2021 Build
israndy
Supercharger Hunter
dbldwn02
Active Member
Just curious. What's the port dangling near the onboard charger, under the back seat? MS 2017 75D.
FWIW, I tried plugging in the OBDLink LX to the physical OBD2 port on a 2022 Model S LR and it would not work using the Scan My Tesla App. Also tried using an adapter cable that mapped pins 18 and 19 of the Blue Diagnostics connector which also didn't work. I'm debating if I should try moving the adapter pins from 18,19 to either 13,14 or 9,10.
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