奔驰W253/X253/W247/W177车灯控制器A2479004104/A2479004204，精准匹配原车

Mercedes-Benz W253/X253/W247/W177 lamp control unit (OEM A2479004104/A2479004204) uses original-grade engineering plastic housing and sealing process; internal copper-on-Cu boards enhance temperature and vibration resistance. This unit controls automatic headlamp on/off, high/low beam switching, and daytime running lights power; signal response delay below 0.1 seconds. If headlamp function is abnormal or fault codes occur, this replacement matches the original vehicle precisely. Requires removal of front bumper inner liner; recommended for technicians familiar with Mercedes CAN bus systems to ensure plugs are firmly seated.