The Mercedes W221 Front Left Seat Belt Buckle with Pretensioner is a safety system component designed for installation on the front left seat of W221 S-Class models. The offered component is from a dismantled vehicle, allowing for an economical yet technically sound replacement of a damaged seat belt buckle.
Specifications and technical data
- SKU: A2218601369
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A2218601369
- Substitutable numbers: A2218601369, A 221 860 13 69
- Location on the vehicle: Front, Left
- Category: Seat Belts & Parts
Vehicle Application and Function
The Front Left Seat Belt Buckle with Pretensioner operates within the factory passive safety system of the Mercedes W221. It is responsible for securely locking the seat belt tongue and cooperating with the pretensioner, which in the event of a collision tightens the belt against the driver's or passenger's body, limiting movement in the seat.
Its placement on the vehicle is on the front left side, which practically means installation near the driver's seat in left-hand drive versions. The component is structurally adapted to the geometry of the seat and the center tunnel in the W221 body, ensuring correct belt routing and compatibility with factory mounting points.
Construction and Safety System Integration
The offered buckle belongs to the seat belts and parts category, meaning it is designed for close cooperation with airbags and the safety system controller. The integrated pretensioner works with the vehicle's electronics, activating in a fraction of a second in a collision situation to reduce slack in the belt.
Key functional features:
- Precise buckle locking – stable retention of the belt tongue in the buckle socket during driving.
- Pretensioner cooperation – ability to dynamically tighten the belt in an emergency.
- Fit for the front left seat – appropriate length and geometry for the driver's position.
- Compatibility with the factory SRS system – maintaining the integrity of the passive safety system.
Benefits of Using an Original Mercedes Part
Choosing a seat belt buckle specifically designed for the Mercedes W221 allows you to maintain the safety parameters intended by the vehicle manufacturer. The original design ensures the correct positioning of the buckle relative to the seat, proper cooperation with the seat belt, and predictable pretensioner operation.
Key advantages of installing this component:
- Factory fit for the W221 body – no need for modifications to mountings or installation.
- Consistency with existing installation – compatibility with the wiring harness and safety system controller.
- Restoration of full seat belt functionality for the front left seating position.
Used Product Characteristics
The component is from a dismantled vehicle, making it a sensible choice for users seeking a solution with a good cost-to-functionality ratio. A used component allows you to restore the safety system's operability when the original buckle has been mechanically damaged or deployed in a collision.
Before installation, it is recommended to verify the correct operation of the locking mechanism and check the pretensioner's electrical connections through a qualified service center to ensure proper cooperation with the SRS system and avoid errors in the airbag controller.
Related Products and Technical Knowledge
If you are looking for other items in the Mercedes seat belts and parts category, check out the Mercedes seat belts and parts available in our store to select compatible components for your model.
When choosing dismantled components, it's beneficial to know the basic principles of their evaluation. You can find more practical information in the article Used Car Parts: Myths and Facts You Need to Know, which helps you make informed purchasing decisions based on real technical parameters, not hearsay.
Summary
The Mercedes W221 Front Left Seat Belt Buckle with Pretensioner is a dedicated safety system component designed for installation near the driver's seat. Thanks to its factory fit for the W221 body and integration with the SRS system, it allows for the restoration of full seat belt functionality in the front left seating position, maintaining the driver protection standards set by the manufacturer.
