MERCEDES IMMO EMULATOR

Project of Immo Emulator for Mercedes Benz vehicles with CAN WFS (Immo Boxes). Emulator support Mercedes Sprinter, A-Class, ML, Vito and other MB cars with CR1 and CR2 Engine Control Units. Can be useful in case of damaged immobilizer, the car key etc.

Schematic diagram is identical for CR1 and CR2 ECU's. The differences are only in frequency of crystal oscillator and content of Attiny. Frequency of crystal oscillator for MB Immo Emulator CR1 is 8MHz, for CR2 is 16MHz. Schematic circuit diagram is simple and does not need any guide. All electronics components are standard and available.

MERCEDES IMMO EMULATOR CR1, CR2 SCHEMATIC DIAGRAM:

Mercedes Immo Emulator - Schematic Diagram

📂 Here you can download a binary files for programming Attiny for this project.

For proper operation of the emulator is required to edit the eeprom content in ECU. Without editing proper addresses of the eeprom data of the ECU, the immobilizer will be active and the vehicle will not start. A short instruction of editing eprom on each ECU's are bellow.

CR2 ECU's with 95P08 / 5P08C3 / 35P08 eeprom.

In addresses from 0x1D0 to 0x2D0 in place of original values write the following data:

95P08 / 5P08C3 / 35P08 eeprom data for MB Immo Emulator CR2

Or simple copy / paste values from 0x1D0 to 0x2D0 from this file.

CR1 ECU's with 24C04 eeprom.

In addresses from 0x1E0 to 0x1FF in place of original values write the following data:

24C04 eeprom data for MB Immo Emulator CR1

Or simple copy / paste values from 0x1E0 to 0x1FF from this file.

Double click to edit

CR1 ECU's with 24C02 / B58 eeprom.

In addresses from 0x38-0x47 in place of original values write the following data:

24C02 eeprom data for MB Immo Emulator CR1

Or simple copy / paste values from 0x38 to 0x47 from this file.

Assembled project of Mercedes CR1, CR2 Immo Emulator

Emulator connects to ECU with 4 wire: Power Supply (12V), GND, CAN-H and CAN-L. Connection is simple. Instructions with pictures about connections of MB Immo Emulator to ECU's with can find on a lot of emulators sellers websites. Some connection can find on this website in pinouts section. The small size of MB Immobilizer Emulator allows installation it directly inside the ECU.

NOTES

❖ When editing eeprom, only selected addresses should be modified. All other data must remain original.

❖ In order to properly function recommended is cut-off CAN-L and CAN-H at WFS (immo box).

❖ Note that dump for Attiny and frequency of crystal oscillator for CR1 ECUs are different that CR2 ECUs. These are two separate projects with the same schematic.

❖ Presented project of MB Immo Emulator is tested and working. It has beed used successfully for many years with Mercedes Sprinter, Vito, ML, A-Class with many CR1 and CR2 ECU’s.