Description
The OEM Master Switch (Part Number: A2139054803 / A21390548038T92) is a genuine Mercedes-Benz control unit installed on the driver-side door panel. It allows centralized control of all power windows and, depending on vehicle specification, may also operate mirror adjustment and window lock functions.
Manufactured to Mercedes-Benz factory standards, this master switch ensures smooth button operation, accurate electrical response, and long-lasting durability. A faulty master switch can cause intermittent or complete failure of window operation, unresponsive buttons, or electrical errors. Replacing it with an OEM master switch restores full driver-side control and original interior functionality.

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