OBDSTAR X300 Classic G3 with C4-07 Kit Virgin Mercedes-Benz Used VGS4 NAG2 722.9 TCM

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 G3withECU Flasher license (orDC706 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.

1. JTAG Contact Exposure

• Gently open the drilled area using precision tweezers.
• Clean adhesive residue from gold contacts using a wooden implement (avoid scratching).

1. 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