How to use CGDI prog MB to program new keys to Benz W212 by OBD

This article shares the method to program new keys to Benz W212 with CGDI MB Key Programmer. Here is the detailed step to use for CGDI programmer users.



CGDI MB Programmer

Mercedes Benz W212 EIS

Mercedes Benz W212 ESL

Original key

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Note: Connect all the devices and keep the power voltage be 12V

Test original key: Insert the key into EIS, can work normally, and pull out the key


Step 1: Calculate Password

Step 2: Generate Key

Step 3: Program Key

Step 4: Test Key


In detail…


Step 1: Calculate Password

Open CGDI MB software

Select “EIS”–>”Read EIS Data” to display key info


Select “Compute Password”–>”Copy key with key” –> Collect Data

Choose other key and then click “OK”


Insert the key into W212 EIS, and click “OK”

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Insert the Key into CGMB, and click “OK”

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Start to calculate password, it will take about 3 to 5 minutes, please be patient

Insert the key into W212 EIS again, and click “OK”

Waiting for 10 seconds

Pull out the key from EIS, and click “OK”

Follow the prompt to repeat all the steps above until calculate password successfully

Save data


Save the file successfully, Please upload the data to calculate PASSWORD


Click “Upload Data” to upload the data file you save just now

Upload data successfully, please click “Query Result” button to query

Note: Ensure the connection kept stable

Computing success!


Step 2: Generate Key

Click “Copy” button to copy the password


Select “EIS” menu and click “Paste” to paste key password


Save file successfully

Select “Generate EE”–>click “Load EIS File” to check EIS data information

Then click “Generate Key File”


Generate the key successfully



Step 3: Program Key

Program key

Insert the new key into the CGDI prog MB

Select “Read/ Write Key”-> “Infrared”-> “Read Key/ Chip”


This key is used. Click “Reset” to erase the key data

Reset operation succeed

Click “Open/Write” button, the key basic data become zero


Note: Smart key please choose 41 format, common key and BE key please choose 51 format! When writing the original key, please make sure that it is wiped by the CGMB, otherwise the write will fail!

Select an unused key file (3_51) to write data


Write success



Step 4: Test Key

Insert the key into Benz W212 EIS to test, ESL can lock and unlock normally

Click “Read EIS Data” again to check the position key 3 is used


Program key successfully!


Author: admin