Tesla Model 3 Airbag crash data reset via Launch X431

This instruction show you guide on how to reset airbag crash data for Tesla Model 3 by Launch X431.

This function is used to reset airbag crash data in order to recycle airbag ECU (Electric Control Unit). (In some countries, erasing airbag crash data without changing airbag assembly is not legal. So, we highly recommend to replacing car’s entire airbag assembly).

Preparations:
Launch X431 V Pro or Launch X431 PAD V

Procedures:

Preparation (For some Model 3 vehicle, there’s no need to remove airbag ECU. If OBDII can communicate normally, please skip this procedure)

Remove airbag ECU from vehicle

Airbag ECU connection position

Airbag ECU wiring diagram

Wiring and pin allocation

+12V: 12V power supply

GND: Ground wire

CAN_H: CAN high

CAN_L: CAN low

Tesla airbag repair designated connector wiring diagram

Resetting airbag crash data software operation procedure

Go into Tesla software, select”Model 3″ ->”Special Function” -> “Service AIRBAG” ,as shown in figure 1, or select”Model 3″ -> “System Selection” –> “SDM Airbag” -> “Special Function”

Unlock airbag ECU, click” Unlock EEPROM After Crash” . It will finish automatically.

Read airbag ECU memory, select “Read EEProm” menu, when reading is done, input backup file name, select backup file storage directory, data backup is done.

Input backup file name, for example “Model_3_20210520”

Click “OK”to backup data.

Read EEPROM and backup finished

Erase crash data, go into ” Erase Crash -Direct” menu, select ” Read EEProm” backup file. The software will automatically perform ” Write EEProm” to write backup data and verify if data written is correct.

Select backup file

Click “Model_3_20210520.bin” to select back file

Edit backup data. Press” YES” to use default data. Press ” Auto Set” to automatically modify value (recommended). Press ” Memory Dump” to manually modify backup data.

if you press ” Auto Set” , it will skip this procedure. Press ” Memory Dump” , you can manually modify backup data. Start address is where the system starts to read backup data and it can be modified manually. After entering start address, press ” Confirm” to write modified data, click ” Restore” to recover it to old value.

Write data, erase airbag crash data.

Verify written data

Write crash data, go into “Write EEProm” menu, select backup file. The software will automatically write backup data and verify if data is correct. This procedure is similar to above mentioned procedure “Erase Crash -Direct” .

Select backup file

Click “Model_3_20210520.bin” to select back file

Edit backup data. Press“YES”to use default data. Press “Auto Set” to automatically modify value (recommended). Press “Memory Dump” to manually modify backup data.