As automotive lighting systems become more intelligent and tightly integrated into the vehicle’s control architecture, even a basic headlight replacement can require module programming.
This is especially true for luxury brands like Mercedes-Benz, where modules such as headlights are often linked to the CAN network and require coding to ensure proper function and communication with the rest of the vehicle.
In this guide, we’ll walk through the full process of programming the left headlight module on a Mercedes-Benz E-Class (W212 chassis) using the Autel MaxiSys MS908S PRO II, a professional Autel scan tool and one of the most advanced car diagnostic tools available for workshop use.
The headlights of the Mercedes-Benz E-Class require programming after replacement.
Begin by connecting the Autel MS908S PRO II to the vehicle’s OBDII port. The scanner will automatically detect the VIN and load the appropriate vehicle profile. Navigate to the main menu and enter the “Programming” section.
This function is essential for modules like headlights that require both flashing (software update) and coding (configuration) after installation or repair.
Within the list of available programmable modules, locate and select “Left Headlight”. Next, choose the “Control Unit Test Run” function to initialize communication and begin setup for programming.
The scan tool will read the current software and firmware data from the vehicle’s headlight module and connect to Autel’s cloud server to retrieve the latest programming files.
Ensure your Autel scan tool is connected to a stable internet connection and that the vehicle’s battery voltage is maintained throughout the operation.
Once the download is complete, the screen will show both the current and available software versions. Confirm by pressing “Yes” to initiate the update. You may also be prompted to update associated systems, such as the right headlight. It is recommended to proceed with all related module updates to ensure system compatibility.
The Autel MS908S Pro II delivers dealership-level ECU programming.
The programming process will take several minutes. During this time, avoid turning off the ignition or disconnecting the scanner. A progress bar on the tablet will indicate the current status.
After programming, the tool will automatically advance to coding. Configuration files retrieved from the server are written to the headlight module, tailoring it to the specific vehicle configuration and lighting package.
Following coding, the system enters the “Control Unit Learning” function, which calibrates and synchronizes the new headlight:
These QR codes are printed directly on the headlight module and are necessary to complete the pairing.
Once the procedure is complete:
After completing the above steps, the warning indicator light will go out.
Headlight module programming on high-end vehicles like the Mercedes-Benz W212 requires advanced tools and procedures. A basic OBD scanner won’t suffice—technicians need a robust car diagnostic tool like the Autel MS908S PRO II that supports cloud-based programming, module coding, and component calibration.
With this Autel scan tool, professionals can confidently handle complex module replacements while maintaining OE-level performance and reliability.
If your workshop handles European vehicles, the MS908S PRO II is a must-have diagnostic solution—capable, expandable, and future-ready.
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