Mercedes-Benz CLS C257 Multibeam Upgrade Review

Mercedes-Benz CLS C257: Elevating Vision with Multibeam Headlight Upgrade

The Mercedes-Benz CLS C257, particularly the facelifted models from 2021 onwards, represents a significant leap in automotive engineering, not just in aesthetics but crucially in driving safety. This review details a professional lighting upgrade, transitioning the vehicle from its stock LED headlights to the latest intelligent Multibeam lighting system. This is not a simple bulb swap; it involves a comprehensive system overhaul, including intricate vehicle computer coding, as performed at Today's Car Seoul Gangbuk branch.

Addressing the Limitations of Stock LED Headlights

While the original LED headlights on the CLS C257 offered adequate illumination, they lacked the advanced functionality and superior visibility of the Multibeam system. Key deficiencies included the absence of adaptive beam patterns for long-distance night driving and insufficient cornering illumination that adjusts with steering input. The CLS's lower seating position and long body mean that wheel wells and fender curves can significantly impact light performance on curves. The Multibeam upgrade intelligently compensates for these structural limitations through sophisticated algorithms.

Sourcing High-Quality Components for the Upgrade

The cost of Multibeam headlights can be substantial. While domestic mid-size sedan equivalents might range from ₩2,000,000 to ₩4,000,000 for a pair, genuine Mercedes-Benz new units can cost between ₩3,000,000 to ₩5,000,000 per set. This price reflects the complexity of the installation and the necessity for electronic coding, adding an estimated ₩800,000 to ₩1,500,000 in labor and software costs. For this upgrade, a Grade A used genuine Multibeam headlight set was utilized. These components, free from repair history or damage, feature a distinctive blue pin structure within the projector and are illuminated by **84 individual LEDs**. Crucially, the manufacturing date was verified; stock parts older than three years pose a risk of internal moisture ingress.

Precision Coding and Alignment with Mercedes-Benz Specialized Equipment

The installation process for the CLS C257 Multibeam headlights is intensive. It begins with the removal of front-end panels, including the bumper, fenders, and fender liners. Given the coupe's size, accessing both headlight units typically requires **1.5 to 2 hours**. Precise alignment, down to the millimeter, is critical. Following the physical installation, Mercedes-Benz-specific diagnostic tools are employed to activate the core functions of the Multibeam system. The coding process includes:

1. Pixel Mode Recognition: Ensuring each of the 84 LEDs can operate independently.
2. High Beam Assist: Enabling automatic high beam deactivation when oncoming traffic is detected.
3. Dynamic Pattern Adjustment: Modifying light intensity and pattern based on speed, steering angle, and preceding vehicles.
4. CAN Bus Communication: Verifying seamless data exchange with all relevant vehicle Electronic Control Units (ECUs).

The sharp, boomerang-shaped daytime running lights (DRLs), a signature of the CLS C257 facelift, are integrated with the Multibeam system. Even minor misalignments can create an asymmetrical appearance, necessitating meticulous adjustment of spacing at each mounting point.

Long-Term Protection with PPF Film Application

To safeguard the sophisticated internal projectors and 84 LED light sources of the Multibeam headlights, external protection is paramount. After installation, a PPF (Paint Protection Film) is applied to the headlight surfaces. This self-healing urethane-based polymer film effectively repairs minor scratches and provides a robust barrier against impacts and environmental contaminants, ensuring the longevity and clarity of the upgraded lighting system.