Mercedes W166 Head Air Module Roof Side Curtain Left N/S A1668600702

Mercedes W166 Head Air Module Roof Side Curtain Left N/S is an original safety component designed for installation on the left side of the vehicle body in W166 series models. As a used curtain, belonging to the Headliner and parts group, it allows for professional post-accident repair while maintaining the factory passenger protection concept.

Specifications and technical data

• SKU: A1668600702
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1668600702
• Substitutable numbers: A1668600702, A 166 860 07 02
• Location on the vehicle: Left
• Category: Headliners & Parts

Purpose and function of the side curtain airbag

The side curtain is responsible for protecting the head and upper torso of the driver and passengers on the left side of the vehicle in the event of a side impact or rollover. This component works in conjunction with impact sensors and the SRS system control unit, creating a cohesive passive safety system characteristic of the Mercedes brand.

Thanks to its precise fit to the roof structure and body pillars, the curtain deploys in a strictly defined zone, minimizing the risk of head contact with the side window or body elements. A correctly selected and installed curtain is crucial for maintaining the protection parameters specified by the manufacturer.

Construction and integration with the headliner

The element belongs to the Headliner and parts group, which means it is structurally linked to the headliner, roof reinforcements, and pillar mounts. The curtain is mounted along the roof edge on the left side, using dedicated brackets and mounting points provided in the W166 body.

The arrangement of the mounts and the shape of the airbag are optimized for the interior geometry so that, upon activation, it creates the most even and stable protective barrier possible. This makes it possible to maintain the appropriate distance between the passenger and the side window as well as the roof structural elements.

Application in post-accident repairs

A used curtain airbag is a solution often chosen for professional post-accident repairs when the SRS system has been triggered on the left side. This allows for the restoration of full safety system functionality while maintaining compliance with the factory specifications of the W166 model.

In workshop practice, the installation of such an element requires:

• verification of compatibility with the specific vehicle equipment version,
• checking the correctness of the mounts within the roof and pillars,
• proper routing of the SRS system electrical harness,
• performing diagnostic tests after installation.

Choosing an original curtain for the Mercedes W166 reduces the risk of fitment issues, headliner leaks, or airbag system errors.

Vehicle placement and installation aspects

The presented curtain is intended for installation on the left side of the vehicle, which is important both when selecting parts and when planning the scope of bodywork and interior disassembly. Correct identification of the installation side is essential for maintaining the proper deployment geometry of the airbag.

During installation, pay attention to:

• correct positioning of the curtain relative to the headliner,
• maintaining factory mounting points,
• absence of abrasions, kinks, or twists in the material,
• compliance with safety procedures when working with SRS systems.

Support in selection and repair expansion

If you are planning a comprehensive repair or upgrade of the roof and side zone in your Mercedes and need other elements from the same group, such as headliner reinforcements, pillar covers, or additional mounting elements, check the available parts in the Headliner and parts Mercedes category.

When performing post-collision repairs, especially during the autumn-winter period, it is worth simultaneously verifying the condition of other used safety elements and interior equipment. Practical checklists and tips on evaluating such components can be found in the article "Winter essentials: which used car parts are worth checking and replacing before the frost?".

If you are preparing a wider body repair after a road incident and want to better plan the use of dismantled parts, the guide "Bodywork and chassis – post-accident repairs using dismantled parts", which discusses the selection of used OEM components and workshop procedures, may also be helpful.