Launch X431 X-Prog3 PC Adapter Virgin Mercedes-Benz VGS4-500-NAG2


The Launch X431 X-Prog3 with PC Adapter can read TCU info & EEPROM data (bench/boot), erase and personalize Mercedes-Benz VGS4-500-NAG2 gearbox, offering the same functionality as the Launch X431 ECU & TCU Programmer. Follow the step-by-step guide to operate.

Operation Guide:
1.Connect devices
Properly connect the X431 PC Adapter to the X-Prog3 key programmer and your computer.

2.Launch the Software
Open the X-Prog3 PC Adapter software (version 10.40). Search for the Mercedes FBS4 VGS4-500-NAG2 gearbox by entering “vgs4” in the search box.


3.Check Wiring Diagram
Check the Direct Connection Wiring Diagram in the software. Follow the on-screen instructions, then click “Confirm” to proceed. 


Wiring Options: The diagram provides two modes: BENCH and BOOT. 
Use BENCH mode to read data from the original vehicle’s gearbox (TCU). 
For wiping and personalizing a second-hand external gearbox, connect both BENCH and BOOT modes simultaneously.

4.Connect to the Original Gearbox
Securely connect the Launch X431 PC Adapter to the original Benz VGS4-500-NAG2 gearbox.



5.Read TCU Information
After completing the connections, click “Read TCU Information” to retrieve data from the original gearbox.

6.Extract EEPROM Data
Click “Read EEPROM Data (BENCH)” to extract the EEPROM data. If BENCH mode fails, switch to BOOT mode and retry.


7.Erase the External Gearbox
After retrieving the original vehicle’s ECU data, connect the X431 X-Prog3 PC Adapter to the external (second-hand) gearbox. Ensure both BENCH and BOOT modes are active, then click “Erase” to clear the external ECU’s data.



8.Personalize the New Gearbox
Click “Personalization,” select the original vehicle’s EEPROM data to write into the external ECU, and confirm with “OK” once complete.


9.Verify and reinstall 
Click “Read TCU Information” again to verify that the external ECU data has been erased and updated successfully.


Reinstall the gearbox into the vehicle. 
Complete any necessary programming and coding to finalize the setup.

Tech support:
Email: sales@launchx431.fr
WhatsApp: +86 18750906257
www.launchx431.fr