Volkswagen T-Roc R-Li Indicator Turn Signal Control Module Left N/S B104161-A

Volkswagen T-Roc R-Li Indicator Turn Signal Control Module Left N/S is a specialized component from the Turn Signals category, designed for precise control of the left turn signal in Volkswagen vehicles. This used module ensures factory-standard signaling logic, allowing for efficient system repair without the need for costly replacement of the entire headlight assembly or wiring harness.

Specifications and technical data

• SKU: L90105841
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: L90105841
• Substitutable numbers: B104161-A, B10 416 1-A, L90105841, L90 105 841
• Location on the vehicle: Left
• Category: Indicator Assemblies

Module purpose and function

The presented control module is responsible for controlling the operation of the left turn signal, integrating signals from the vehicle's electrical system with the lighting elements. It is a solution dedicated to the Volkswagen T-Roc design, engineered for proper compatibility with the factory lighting system and body electronics. By utilizing the original control architecture, the module maintains correct operating parameters, such as flash frequency, response to turn signal activation, and compatibility with the vehicle's diagnostic systems. This is particularly important in modern cars, where lighting signals are closely linked to safety systems and CAN bus communication.

Construction and system integration

The module has been developed as a component for installation on the left side of the vehicle, which facilitates its identification and correct assignment during repair. The design provides for compatibility with the factory wiring harness, meaning installation is limited to properly connecting the plugs and securing the unit in the designated location. In practice, this means that by following appropriate service procedures, the module can be replaced without interfering with other lighting system components. This configuration reduces the risk of installation errors and ensures consistency with the original Volkswagen electrical system design.

Benefits of using a pre-owned part

Choosing a used control module is a cost-effective solution, especially for post-accident repairs or restoring full lighting system functionality after an electronic failure. The original component from disassembly retains factory operating parameters while allowing for significant cost savings compared to purchasing a new part. This approach is frequently used in professional workshops and for informed maintenance of VAG group vehicles, where both technical compliance and reasonable repair budget management are prioritized. A used turn signal control module can also be a good choice for retrofit projects that utilize components from higher trim levels.

Benefits of using a dedicated module

• Consistency with factory electronics – a module designed to work with Volkswagen systems minimizes the risk of communication errors and turn signal malfunctions.
• Precise control of the left turn signal – maintaining the correct flash frequency and response to signals from the steering column switch and onboard systems.
• Reduced scope of repair – the ability to replace only the module instead of the entire lighting assembly or wiring harness.
• Reasonable service costs – using a pre-owned part allows for budget optimization while maintaining an appropriate level of quality.

Support for upgrades and retrofits

In VAG group vehicles, retrofit and lighting upgrade projects are becoming increasingly common, where properly selected control modules play a key role. If you are interested in the broader context of such modifications and want to better plan the use of components from disassembly, it is worth checking out the practical tips in the article on retrofitting in VAG and BMW cars. If you are planning a comprehensive repair or upgrade of the exterior lighting zone in your Volkswagen and need other elements from the same group, such as control modules, lamps, or turn signal assemblies, check out the available parts in the Volkswagen Turn Signals category.