The Rear Differential Actuator Motor in a Mercedes is a component that plays a crucial role in the functioning of the vehicle's differential system. The differential is responsible for distributing power between the wheels, allowing them to rotate at different speeds, particularly when turning. The actuator motor is an electric or electronically controlled motor that engages and disengages the rear differential lock. This feature is often found in Mercedes vehicles equipped with all-wheel drive (AWD) or 4MATIC systems.

When engaged, the rear differential lock ensures that both rear wheels receive an equal amount of power, improving traction and stability in challenging driving conditions such as off-road terrain or slippery surfaces. The actuator motor is responsible for activating the mechanism that locks the rear differential.

Overall, the Rear Differential Actuator Motor enhances the vehicle's performance and safety by providing better control and traction in various driving situations.