Ford Fiesta St Interior Rear View Mirror Electrochromic BU5A-17E678-TB

Visual condition of the part

The product shows signs of use visible in the photos.

Ford Fiesta St Interior Rear View Mirror Electrochromic is an original component from the Rear view mirrors group, designed specifically for installation in the rear cabin area. The electrochromic design improves driving comfort after dark by reducing glare from the headlights of vehicles behind you and ensuring stable visibility in the mirror.

Specifications and technical data

• SKU: RHD-BU5A-17E678-TB
• Mark: Ford
• Condition: Used
• OEM Part Number: BU5A-17E678-TB
• Substitutable numbers: BU5A-17E678-TB, BU5A17E678TB, 1834704
• Location on the vehicle: Rear
• Category: Rear View Mirrors

Technical characteristics of the electrochromic mirror

The presented interior mirror is intended for installation in the rear part of the cabin, in the factory mounting location on the windshield. The applied electrochromic technology automatically dims the reflective surface when the sensor detects intense light from behind the vehicle. As a result, the driver gains more stable road observation conditions without the need to manually switch the mirror mode.

The original Ford origin ensures the preservation of factory optical parameters, the correct field of view, and compatibility with the vehicle's standard electrical system. The mirror has been designed for a precise fit to the headliner and windshield, which facilitates installation and eliminates the risk of unwanted vibrations while driving.

Purpose and function in the vehicle

The electrochromic interior mirror in the Ford Fiesta ST plays a key role in monitoring the situation behind the vehicle, especially when driving at night and in urban conditions. Automatic dimming reduces eye fatigue, improves driver concentration, and increases comfort on long journeys. Its placement in the rear cabin area ensures an optimal line of sight relative to the rear window and side mirrors.

Compared to simple manual mirrors, the electrochromic solution provides a smoother response to changes in light intensity, which translates into better image clarity in the mirror and more predictable behavior in traffic.

Benefits of using an original Ford mirror

• Factory fit – maintaining the original geometry and field of view intended by the manufacturer.
• Interior consistency – design and finish consistent with the Ford Fiesta ST cabin design.
• Stable electrochromic system operation – automatic dimming without the need for driver intervention.
• Hassle-free installation – the mirror is prepared for installation in place of the factory component, without structural modifications.

By using an original interior mirror, the driver maintains the technical and visual consistency of the interior while benefiting from the advanced automatic dimming function, which improves safety and comfort in daily use.

Component condition and service application

The offered mirror comes from the secondary market, making it an attractive solution for post-accident repairs, replacing a damaged component, or restoring the full functionality of the vehicle's interior. Choosing a used OEM component allows you to maintain high part quality while reducing service costs, which is particularly important for comprehensive interior repairs.

If you are planning a comprehensive repair or upgrade of the interior visibility zone in your Ford and need other components from the same group, such as standard interior mirrors, photochromic mirrors, or mirrors with additional functions, check the available parts in the Ford rear view mirrors category.

To better plan service work and utilize the potential of used OEM components, it is worth reading the guide: Availability of car parts off-the-shelf vs. repair time – how do used OEM parts shorten workshop stays?.