BMW 1 3 5 6 Series E60 E63 E87 E90 Unit Seat Left N/S Lumbar Support Switch

BMW 1 3 5 6 Series E60 E63 E87 E90 Unit Seat Left N/S Lumbar Support Switch is an original control element for the seat support system, designed for installation on the left side in selected BMW models. Thanks to its precise OEM design, it ensures convenient, repeatable seat support adjustment, which translates into better driving comfort and a stable driver position. This is a practical solution for users who want to restore full seat functionality or replace a missing control module.

Specifications and technical data

• SKU: 8352291
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8352291
• Substitutable numbers: 61318352291, 8352291, 61316945537, 6945537
• Location on the vehicle: Left
• Category: Seats and Sofas

Purpose and function in the seat system

The switch is responsible for seat adjustment and inflation, i.e., controlling the pneumatic or electric support in the seat base or backrest, depending on the specific vehicle configuration. The component is located on the left side of the vehicle, which in practice means operating the driver's seat in standard European versions.

A properly functioning switch allows for:

• precise adjustment of support to the driver's physique,
• increased body stability during long journeys,
• relief for the lumbar and thigh areas,
• consistent operation with other seat adjustment functions.

Construction and fit for BMW models

As an element from the Seats and Benches group, the switch has been designed specifically for installation in BMW E60, E63, E87, and E90 series seats. This means maintaining factory mounting geometry, appropriate electrical connectors, and an ergonomic shape adapted to the side part of the seat.

Key design features:

• original OEM form ensuring compatibility with the factory wiring harness,
• logical button layout facilitating operation without taking your eyes off the road,
• housing adapted for use in an area exposed to frequent contact with hands and clothing.

Component condition and service application

The switch comes from the secondary market, making it an attractive solution for maintenance repairs or interior restoration. A used OEM component often provides better fit and durability than generic replacements, especially in the area of seat control elements.

The product will prove useful in situations where:

• the original switch has suffered mechanical or electrical damage,
• the control module is missing after a seat replacement,
• it is necessary to restore full functionality of the seat adjustment and inflation.

User comfort and ergonomic aspect

A functional seat adjustment and inflation switch has a direct impact on the ergonomics of the driver's area. The ability to quickly correct support while driving helps reduce muscle fatigue and improves the subjective feeling of stability behind the wheel. Combined with other seat adjustment functions, it creates a coherent, comfortable system of settings, which is particularly important in cars used for long distances.

Expansion and other BMW interior equipment elements

If you are planning a comprehensive repair or upgrade of the seating area in your BMW and need other elements from the same group, such as rails, adjustment mechanisms, or additional control modules, check the available parts in the BMW Seats and Benches category.

If you want to plan a broader interior refresh and combine the switch replacement with improving the overall quality of the interior, you will find practical tips on selecting seats, steering wheels, and multimedia systems from the secondary market in the article Premium interior for half the price: second-hand seats, steering wheels, and multimedia.

For users considering different service strategies when choosing elements such as switches, modules, or other interior components, it may also be helpful to compare the advantages of new and used parts described in the material Car parts – new or used? We compare costs, quality, and durability.