Mercedes W221 Seat Tensioner Seatbelt Buckle Right Front is an original safety system component designed for installation on the front right seat of the S-Class W221 generation models. It is a functional seatbelt buckle with a tensioner, engineered by the manufacturer to maintain a high level of protection for the driver or passenger.
Specifications and technical data
- SKU: A2218601669-1
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A2218601669
- Substitutable numbers: A2218601669, A 221 860 16 69
- Location on the vehicle: Front, Right
- Category: Seat Belts & Parts
Purpose and Function in the Vehicle
The seat tensioner with a seatbelt buckle is responsible for securely fastening the seatbelt and cooperating with the vehicle's passive safety systems. This component is installed on the front right seat, where it:
- ensures a secure belt fastening and proper belt routing relative to the user's body,
- cooperates with the vehicle's safety systems, such as the airbag control unit,
- helps to limit body movement during sudden braking or collision.
Its dedicated placement in the vehicle preserves the factory mounting geometry of the belt, which translates to predictable performance of the entire safety system.
Construction and Technical Features
The seat tensioner integrated with the seatbelt buckle is designed as an OEM Mercedes part, ensuring compliance with the vehicle's factory standards. The construction includes:
- a tensioner unit responsible for dynamically tightening the belt in a critical situation,
- a seatbelt buckle with a latch receptacle matched to the factory belt,
- adaptation for installation in the factory mounting points of the front right seat.
This solution allows for consistency with the vehicle's original installation, without the need for modifications to the seat or body structure.
Benefits of Using an Original Seat Tensioner
Using an original seatbelt buckle with a tensioner in a Mercedes S-Class W221 offers a range of practical benefits:
- Factory Fitment – the component was developed specifically for this vehicle generation, facilitating installation and reducing the risk of improper fit.
- Compatibility with Safety Systems – the tensioner is designed to work with the electronics and airbag system of the specific model.
- Restoration of Original Functionality – replacing a damaged component with an original one allows for the restoration of proper seatbelt function on the passenger or driver's side (depending on the vehicle version).
- Solution Consistent with Seat Design – maintaining the original belt path and fastening point improves user ergonomics.
Condition, Origin, and Practical Application
The offered seat tensioner with seatbelt buckle is a used part from a dismantled vehicle and belongs to the category: Seatbelts and Parts. It is a good solution for users who want to economically restore the full functionality of the safety system after:
- deployment of the airbag and tensioner system,
- mechanical damage to the buckle or tensioner,
- the need to replace the component after a collision or seat repair.
Choosing a used OEM component allows for consistency with the vehicle's factory specifications while reducing costs compared to purchasing a new part.
Other Mercedes Seatbelts and Parts and Technical Knowledge
If you are looking for other Mercedes seatbelts and parts, check out our dedicated offer: Mercedes Seatbelts and Parts. You will find a wide selection of safety system components tailored for various models of this brand.
When selecting dismantled components for electronic and safety systems, it is advisable to be aware of the specific operation of modules and control units. Helpful information can be found in our blog article dedicated to servicing electronics in premium vehicles: Years of Driving Pleasure – How to Care for iDrive Systems and Electronic Modules in BMW 3 and 5 Series Models Using Dismantled Parts?. Although it concerns a different brand, it demonstrates good practices when working with automotive safety and electronic components.
If you are considering the choice between new and used components, a comparison of costs and quality in the context of dismantled parts may also be helpful: New or Used? A Comparison of Costs and Quality of Car Parts. This will help you better assess when a used seat tensioner will be an optimal service solution.
