Diagnostic Connectionslink
Last updated: October 20, 2023
Diagnostic Portslink
2024+ Model 3 is equipped with a consolidated diagnostic port which complies with SAE J1962 or ISO 15031-3 form factor. This port supports both CAN and Ethernet communication. It also provides an interface for running ODIN (On-board Diagnostics Interfaces) routines with local connection.
A pair of CAN High and CAN Low wiring is connected from the left vehicle controller (VCLEFT) directly to the diagnostic port. This VCLEFT private CAN network is called On-board Diagnostics (OBD) CAN. Information used for European taxis like Vehicle Identification Number (VIN) and signals are communicated over this private CAN.
Different from 2024+ Model 3, Model 3 vehicles made before 2024 have different form factors to support diagnostic communication via Ethernet or CAN. See the table below for more details:
Diagnostic Port Form Factors
| Connector Form Factor | Illustration | Model 3 vehicles built
|
Model 3 vehicles built
|
2024+ Model 3 vehicles built from Gigafactory Shanghai beginning 01-SEP-2023 |
|---|---|---|---|---|
| OBD Connector |  |
Support CAN communication | Support CAN communication | Support Ethernet and CAN communication |
| Diagnostic Connector Cabin |  |
Support Ethernet communication | Connector does not exist | Connector does not exists |
| RJ45 Connector |  |
Connector does not exist | Support Ethernet communication | Connector does not exists |
OBD Connector Pin Layoutlink
2024+ Model 3 On-board Diagnostics (OBD) connector contains both Ethernet and CAN pins for on-board diagnostics. See the following table for more information about the pin layout:
| Pins | Description | Pin Type | Plating | Terminal Size | Comments |
|---|---|---|---|---|---|
| 1 | Not Connected | Sn | 1.5 | ||
| 2 | Not Connected | Sn | 1.5 | ||
| 3 | RX+ | Ethernet | Sn | 1.5 | 100BASE-T |
| 4 | Chassis Ground | Ground | Sn | 1.5 | Chassis ground and power ground |
| 5 | Ground | Ground | Sn | 1.5 | Signal ground |
| 6 | CAN H | CAN | Sn | 1.5 | VIN, EDR read in China, speed info read in Europe |
| 7 | Not Connected | Sn | 1.5 | ||
| 8 | Activation Line | Special | Sn | 1.5 | Pull-up to activate regulated communication |
| 9 | Not Connected | Sn | 1.5 | ||
| 10 | Not Connected | Sn | 1.5 | ||
| 11 | RX- | Ethernet | Sn | 1.5 | 100BASE-T |
| 12 | TX+ | Ethernet | Sn | 1.5 | 100BASE-T |
| 13 | TX- | Ethernet | Sn | 1.5 | 100BASE-T |
| 14 | CAN L | CAN | Sn | 1.5 | VIN, EDR read in China, speed info read in Europe |
| 15 | Not Connected | Sn | 1.5 | ||
| 16 | VBATT | Power In | Sn | 1.5 | battery voltage 12V, 4A (switched power) |
 |
|---|
| Contact Designation for Vehicle Connector Mating End View |
DoIP Gatewaylink
The DoIP Gateway is only enabled during inspection when a diagnostic port connection is detected and the hardwired activation line is pulled high (> 5V). The DoIP Gateway will shut down when the diagnostic port is disconnected and activation line is no longer pulled high.