Seat Air Module Mercedes W204 W207 Coupe Front Right O/S Side Air A2078605402

The Mercedes W204 Front Right Seat Airbag is an original passive safety system component designed for installation in the front right seat of Mercedes W204 vehicles. A used seat airbag allows for professional SRS system repair while maintaining factory geometry and predictable system operation.

Specifications and technical data

• SKU: A2078605402-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2078605402
• Substitutable numbers: A2078605402, A 207 860 54 02
• Location on the vehicle: Front, Right
• Category: Seat Belts & Parts

Intended Use and Function in the Safety System

The seat airbag is responsible for protecting the front right passenger, working in conjunction with seatbelt pretensioners and the SRS control unit. This component is an integral part of the seat belts and parts category, contributing to the reduction of forces acting on the body during a side or frontal collision.

Its placement within the seat structure and its adaptation to the Mercedes W204 design ensures:

• correct activation sequence within the complete airbag system,
• compatibility with the factory SRS control unit calibration,
• preservation of the manufacturer-intended protective zone for the passenger.

Construction and Fit for the Front Right Seat

The airbag has been specifically designed for installation in the front right seat, taking into account the shape of the seat cushion, backrest, and the routing of electrical connections. This enables:

• precise fitting with the seat structure without interfering with its load-bearing elements,
• correct routing of the wiring harness and connectors within the seat tunnel,
• secure mounting of the airbag module, minimizing the risk of looseness and unwanted vibrations.

Such a fit is crucial for maintaining the correct inflation characteristics of the airbag and the direction of the protective force.

Benefits of Using an Original Seat Airbag

Using an original seat airbag in a Mercedes W204 offers a range of practical service and user benefits:

• compliance with the original SRS system design – no need for mechanical or electrical adaptation,
• predictable behavior during deployment – operating parameters consistent with the vehicle manufacturer's specifications,
• easier diagnostics – correct component identification by service testers,
• compatibility with other seat belt and parts used in this model.

This solution is particularly recommended for professional post-accident repairs where restoring the original safety configuration is paramount.

Condition, Installation, and Service Aspects

The component comes from the secondary market, allowing for economical repair of the airbag system while maintaining original specifications. Before installation, it is recommended to perform:

• visual inspection of the housing and connectors for mechanical damage,
• checking the vehicle's electrical system and circuit resistance,
• diagnostics of the SRS control unit and clearing any errors after replacement.

Installation should be carried out by a workshop experienced in working with airbag systems, adhering to safety procedures (disconnecting power, proper handling of connectors, correct tightening torques for fasteners).

Expanding the Mercedes Safety System

If you are looking for other components from the Mercedes seat belts and parts category for your vehicle, check out our dedicated offer: Mercedes seat belts and parts. There you will find compatible components to comprehensively restore or supplement the passenger protection system.

When planning major repairs, including those related to the vehicle's drivetrain, it is worth consulting our blog post: Used differentials – what you should know about used differentials, sensors, and drivetrain systems. This article helps you make informed choices when selecting used components and minimize the risk of unforeseen service costs.