Mercedes Vito Viano W639 Steering Wheel Airbag Air Module Black A6398602502

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes Vito Viano W639 Steering Wheel Airbag Air Module is an original safety component designed for installation in the steering wheel of vehicles in this series. This used black airbag allows for a technically correct repair of the passive safety system following deployment or damage to the factory airbag. It is a solution for users who expect factory-fit and the preservation of a consistent interior aesthetic.

Specifications and technical data

• SKU: A6398602502
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398602502
• Substitutable numbers: A6398602502, A 639 860 25 02
• Color: Black
• Category: Other Interior Parts & Accessories

Purpose and function in the vehicle

The driver's airbag is responsible for protecting the person operating the vehicle in the event of a frontal or partial frontal collision. This component works in conjunction with the SRS control module, crash sensors, and seatbelt tensioners to form a cohesive passive safety system. Using a dedicated airbag for the Mercedes Vito Viano W639 ensures correct mounting geometry, proper attachment points, and the inflation characteristics specified by the manufacturer.

Construction and visual fit

The presented driver's airbag features a black finish, which facilitates integration with most factory steering wheels used in the Mercedes Vito Viano W639. The color scheme helps maintain a consistent cockpit appearance without the need for additional interior modifications. The airbag housing construction is prepared for installation in the dedicated steering wheel rim, maintaining the manufacturer's specified mounting points and wiring harness routing.

Benefits of using an original airbag

Using a driver's airbag designed for a specific vehicle model ensures:

• proper fitment with the steering wheel and steering column covers,
• preservation of factory ergonomics for steering wheel buttons and controls (if present),
• a consistent interior look thanks to the matched color scheme,
• the ability to restore the correct SRS system configuration after post-accident repairs.

For workshops and users, this means easier installation, fewer modifications, and greater predictability of the entire safety system's operation.

Product condition and service application

The driver's airbag is an aftermarket component, which allows for economical vehicle repair while maintaining the original design. This type of component is particularly useful in cases of:

• post-accident repairs after SRS system deployment,
• comprehensive interior restoration following mechanical damage,
• service centers specializing in Mercedes Vito Viano W639 commercial vehicles.

Before installation, it is recommended to verify compatibility with the specific vehicle equipment version and to perform diagnostics on the airbag system using an appropriate tester.

Integration with other safety elements

The driver's airbag works with the control module, crash sensors, and the vehicle's electrical system. Proper installation requires following service procedures, including disconnecting the power supply, checking wiring harnesses, and subsequently clearing any errors in the SRS controller. A correctly selected airbag helps restore full functionality to the safety system, which has a direct impact on driver protection in emergency situations.

If you are planning a comprehensive repair or upgrade of the cockpit area in your Mercedes and need other components from the same group, such as steering wheel covers, control modules, or additional trim elements, check out the available parts in the Other Mercedes category.

To better understand the differences in the construction of drivetrain and braking systems between standard and sports versions, it is worth reading the article comparing technical solutions in the RS range – details can be found in the post Audi RS vs other models – what is hidden under the hood and chassis?.