This guide provides a detailed walkthrough on how to use OBDSTAR X300 Classic G3 and C4-07 Adapter Kit to virgin (erase) and transfer data from a used Mercedes-Benz VGS4 722.9 7-speed TCU.
Background Information
The 4-4 ECU board for the Mercedes-Benz 722.9 7-speed TCM is commonly found in models such as the S-Class (W222), E-Class (W205), and GLC (W166) from 2014 onwards. For original ECUs, data can be read and written directly via BENCH mode or OBD mode. However, for used ECUs, the C4-07 adapter kit is necessary to drill holes and perform data erasure and writing in JTAG mode.
Preparation
Before starting, ensure you have the following tools and components:
- Mercedes VGS4-0 TCM
- X300 Classic G3with ECU Flasher license (or DC706 full)
- OBDSTAR C4-07 Adapter Kit(includes C4-07-01 soldering-free board, C4-07-02 custom positioning board, W011, W020-V1.1, 22mm custom drill head)
- OBDSTAR MP001 programmer
- OBDSTAR TCM-012 Benz VGS Adapter
- Converter V2
- Handheld electric drill
- Main cable
- Marked pen
- Tweezers
- Power supply
Software Configuration
1.Open ECU Flasher software → Navigate to TCM selection → Choose the most recent firmware version.
2.In the top-right search field, enter “VGS4” to identify the appropriate TCM model.
3.Configure JTAG mode and select the MP001 programmer.
4.Access the [Guide] section and thoroughly review:
- Warnings
- Functional description
- Kit contents
- Menu navigation instructions
- Wiring diagrams
Hardware Connection Process
A. Drilling Preparation
- Position the C4-07-02 alignment board on the TCU and mark drilling locations with a marker.
- (Optional) Apply soldering iron heat to marked points to prevent bit slippage.
- Perform drilling with the 22mm bit while maintaining controlled depth.
- Remove metal debris using compressed air.
- JTAG Contact Exposure
- Gently open the drilled area using precision tweezers.
- Clean adhesive residue from gold contacts using a wooden implement (avoid scratching).
- Virginization Procedure
1.Adapter Installation:
Align C4-07-01 adapter with TCU’s three positioning pins and secure firmly.
2.System Connection:
Link MP001 programmer → C4-07-01 adapter → Connect TCM-012 cable → Power on the MP001 unit.
3.Data Erasure:
Read TCU information (should indicate “personalized/activated”)
Click Connect → Read Data → Save backup file
Perform TCU erasure (removes VIN and adaptations)
Verify virginization status (TCU should show no stored VIN)
Data Transfer Methods
Method 1: Bench Programming
Transfer original vehicle’s TCU data to the refurbished unit
Install TCU → Vehicle should operate normally
Method 2: In-Vehicle Programming
Install virginized TCU in the vehicle
Complete programming using MB Star diagnostic system
Completion Steps
Apply sealant to drilled hole if required
Archive data files to designated storage
Learn more:
OBDSTAR C4-07 (MB-VGS4-0-NAG2) Adapter Kit: Solder-free Virgin for Benz FBS4 TCM
