Mercedes W177 Saloon Rear Seat Backrest Lock Release Latch Catch A1779204102

Mercedes W177 Saloon Rear Seat Backrest Lock Release Latch Catch is an original mounting component designed for the rear cabin, responsible for the secure and controlled locking of the seat backrest. Thanks to the factory Mercedes design, the latch ensures the proper operation of the folding and support mechanism, which translates into safe use of the rear bench seat and stability while driving. It is a practical solution for users who want to restore the correct functionality of the seats in their vehicle.

Specifications and technical data

• SKU: A1779204102-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1779204102
• Substitutable numbers: A1779204102, A 177 920 41 02, KD
• Location on the vehicle: Rear
• Category: Additional Seat Parts

Purpose and function of the backrest latch

The backrest latch in the Mercedes W177 model is responsible for mechanically maintaining the backrest in a set position in the rear of the vehicle. The component works with the seat frame structure, enabling:

• stable locking of the backrest after it is raised,
• controlled release of the lock when folding the backrest,
• maintenance of the proper geometry and rigidity of the rear bench seat.

This solution is important both for passenger comfort and for trouble-free use of the luggage space, especially when frequently folding and unfolding the backrests.

Compatibility and placement in the vehicle

The presented latch is intended for installation in the rear of the interior, on the left or right side of the seat backrest, in accordance with the seat design of the specific unit. Thanks to its factory origin from the Mercedes range:

• compatibility with the original seat mechanism is maintained,
• the component works with standard guides and catches,
• installation is carried out at existing mounting points without the need for modifications.

Such a fit reduces the risk of play, improper closing of the backrest, or unwanted noises while driving.

Performance characteristics and advantages of the OEM solution

The original backrest latch for the Mercedes W177 has been designed for long-term, repeatable operation in demanding conditions. Using this component allows you to:

• restore the proper operation of the rear backrest folding mechanism,
• reduce the risk of accidental unlocking of the backrest while driving,
• maintain the structural consistency of the seats with the rest of the vehicle interior.

For the user, this means more predictable seat behavior, more convenient use of the split-bench function, and maintenance of the factory safety and ergonomics standard.

Economic aspect and condition of the part

The element comes from the Other seat parts group, which allows for the precise replacement of only the damaged sub-assembly, without the need to purchase a complete seat. A used OEM component is a reasonable compromise between cost and maintaining original build quality and fitment. In practice, this enables an economical repair of the backrest mechanism while maintaining compliance with the vehicle's factory specifications.

Selection support and additional information

When selecting a backrest latch for a specific version of the Mercedes W177, it is worth paying attention to the rear bench configuration and the mounting side to ensure full compatibility with the existing mechanism. If necessary, vehicle identification data and comparing the component's design with the currently installed part may be helpful.

If you are planning a comprehensive repair or upgrade of the rear seating area in your Mercedes and need other elements from the same group, such as guides, catches, or adjustment mechanisms, check the available parts in the Other Mercedes seat parts category.

For drivers preparing their car for the winter season and wanting to consciously approach the inspection of used components in the interior and other vehicle systems, the following guide will be useful: Winter essentials: which used car parts are worth checking and replacing before the frost?.