166 905 4400 Power Window Master Switch for Mercedes-Benz W166 W176 W246 X166

◆ This power window master switch is a direct replacement for the original Mercedes-Benz unit, designed to control all four door windows from the driver's side door panel.

◆ The OEM reference number is 166 905 4400 (also written as A1669054400). It is a 3-pin push-pull switch with black housing and red button illumination, positioned at the front left (driver side) .

◆ The switch is engineered to OEM standard dimensions for direct fitment into the driver’s door armrest without modification.

◆ It is primarily designed for a wide range of Mercedes-Benz models including the A-Class (W176), B-Class (W246), CLA (C117), GLA (X156), GLE/ML (W166), GL/GLS (X166), and G-Class (W463), covering model years from approximately 2012 through 2019 .

◆ This product is a power window control switch assembly manufactured to meet original quality standards for switching response, fit, and durability.

◆ Part Number: 166 905 4400 / A1669054400

◆ Component Type: Power Window Master Switch / Door Window Control Switch

◆ Vehicle Make: Mercedes-Benz

◆ Placement: Front Left (Driver Side)

◆ Connector: 3-pin

◆ Button Illumination: Red

◆ Housing Color: Black

◆ Switch Type: Push Pull Switch

◆ Note: Verify connector type and button configuration against your original switch before ordering

◆ OEM Standard Fit: Manufactured to exact original specifications for a direct, hassle-free replacement .

◆ Master Control Function: Operates all four door windows from the driver's position, restoring full convenience control.

◆ Illuminated Design: Red backlit buttons for clear visibility during night operation .

◆ Durable Construction: Built with ABS plastic housing resistant to wear and repeated use .

◆ Mercedes-Benz A-Class (W176): 2012–2019

◆ Mercedes-Benz B-Class (W246): 2012–2019

◆ Mercedes-Benz CLA (C117): 2013–2019

◆ Mercedes-Benz GLA (X156): 2014–2019

◆ Mercedes-Benz GLE/ML (W166): 2012–2019

◆ Mercedes-Benz GL/GLS (X166): 2013–2019

◆ Mercedes-Benz G-Class (W463): 2013–2019

◆ Note: Some listings also reference fitment for Tesla Model S/X in aftermarket cross-reference data . Verify against your vehicle’s original part number and VIN before ordering.

Q1: Is this a genuine Mercedes-Benz part?

A: The 1669054400 reference is the original equipment part number. Both genuine Mercedes-Benz and aftermarket equivalents are available that match the original fit and function .

Q2: How do I confirm if it fits my vehicle?

A: Check your vehicle's existing switch. If it is stamped with 1669054400 or A1669054400, this replacement will fit. Also confirm your vehicle model and year against the compatibility list above. Sending your VIN to the seller for verification is recommended.

Q3: What are the symptoms of a failing window master switch?

A: Common signs include one or more windows failing to operate from the driver’s switch panel, intermittent window operation, and buttons that feel loose or fail to click when pressed. Before replacing the switch, check the window motor, fuse, and wiring, as these can also cause similar symptoms .