Mercedes-Benz Headlight Control Unit LEFT - 74971400

OEM headlight control unit (ballast/module) designed for Mercedes-Benz vehicles. This module regulates and powers the xenon or LED headlight system, ensuring stable illumination, proper beam control, and communication with the vehicle’s lighting electronics.

Position:
Left-hand side (LH) – passenger side on right-hand drive vehicles

Key Functions:

• Controls voltage and current to headlight
• Manages xenon/LED light output
• Supports adaptive lighting systems (AFS)
• Enables DRL, low beam, high beam functionality
• Communicates with ECU for diagnostics

Vehicle Compatibility:

• Mercedes-Benz E-Class W212 (2010–2016)
• Also used on selected CLS, C-Class, GLK (varies by spec)

Interchange / Cross Reference:

• Paired with right side: 74962502
• May correspond to OEM A212 / A218 series modules

Common Fault Symptoms:

• Headlight not working
• Flickering or dim light
• “Low beam malfunction” warning
• Adaptive light failure

Installation:

• Direct fit (plug & play)
• Coding/calibration may be required after installation