How to Connect and Diagnose a Tesla with the Launch X431 EV Diagnostic Kit

The Launch X431 series is equipped to diagnose electric vehicles, including Tesla models. To effectively diagnose Tesla vehicles, additional accessories and specific software are required. This guide will walk you through the process using the Launch X431 EV Diagnostic Kit as an example.

Contents:

1. Launch X431 Tesla 12+20 Connector
2. Launch X431 Tesla Airbag Reset Adapter
3. Tesla Software Activation for Launch Scanners

Tesla Software Compatibility

To diagnose Tesla vehicles, the appropriate software must be activated. The “TESLA” software is compatible with the following Launch X431 models:

• PAD VII
• PAD V
• PAD II
• X431 V 8″
• X431 V+
• X431 PRO5
• Pros V1.0

You can purchase the Tesla software and check the supported vehicle list here.

1. Launch X431 Tesla 12+20 Connector

The Tesla 12+20 adapter is a key component included in the Launch X431 EV Kit, designed for use with Tesla Model S and Model X vehicles.

Functions:

• Basic diagnostics such as ECU information retrieval, live data, and reading/clearing fault codes.
• Special functions include:
  • BMS reset alarm
  • Clearing the BMS contactor stress index
  • EPB service mode
  • Brake bleeding for Model X and Model S

For detailed vehicle and function coverage, visit the function list.

Wiring Diagram:

• 12-Pin Connector: Located under the central control screen, this is a special connector used for airbag diagnostics and repairs on Model S and Model X. It is primarily used for resetting airbag crash data.
  • Pinout for Model S Airbag Control Module:
    • +12V: Power supply
    • GND: Ground
    • CAN_H: CAN High
    • CAN_L: CAN Low
  • Pinout for Model 3 Airbag Control Module:
    • Similar to Model S, with variations specific to Model 3.

2. Launch X431 Tesla Airbag Reset Adapter

This adapter is essential for resetting airbag crash data on Tesla vehicles. It includes specific connectors and pinouts for various Tesla models, ensuring accurate diagnostics and repairs.

3. Battery Test Cable for Tesla Model 3/Y

Included in the Launch X431 EV Kit, this cable allows for testing the battery pack’s 3-circuit system and data flow on Model 3 and Model Y vehicles. Note that this EV kit is compatible only with PAD V and PAD VII.

4. LAN Diagnostic Connector for Launch X431

The LAN Diagnostic Connector is used with the LAN (Local Area Network) function, which automatically enters maintenance mode. Supported Launch X431 models include:

• X431 PRO 3S+ V3.0/V5.0

Shift Board Compatibility:

• 2018 and later: Model 3/Model Y
• 2022 and later: Model S/Model X
• 2018-2021: Model S/Model X
• 2014-2018: Model S/X with Tegra Chip MCU

This guide provides a comprehensive overview of how to connect and diagnose Tesla vehicles using the Launch X431 EV Diagnostic Kit. Ensure that you have all the necessary components and software activated before beginning your diagnostics.