Audi VW Volkswagen Seat Relay Unit Module 4 Pins 12V 4D09907131

Audi VW Volkswagen Relay Unit Module 4 Pins 12V is a specialized component from the Relays group, designed to control seat power supply in VAG group vehicles. Thanks to its compact design and defined 4-pin layout, the module ensures stable operation of the seat electrical system at 12V onboard voltage, supporting the safe functioning of adjustment and comfort systems.

Specifications and technical data

• SKU: 4D0907131
• Mark: Audi
• Condition: Used
• OEM Part Number: 4D0907131
• Substitutable numbers: 4D0907131, 4D0 907 131
• Category: Relays

Purpose and function of the seat relay module

The presented seat relay module is responsible for switching power circuits in the seat system, which allows for controlled power delivery to selected seat functions. The use of a dedicated relay reduces the load on the control system, improves system reliability, and decreases the risk of overheating wires and switches.

The solution based on a 4-pin connector enables clear routing of control and power signals, which facilitates diagnostics and service. The module operates in a standard 12V system used in Audi and Volkswagen passenger cars, ensuring compatibility with the vehicle's factory electrical architecture.

Construction, connectors, and system integration

The seat relay module is designed as a compact component mounted in the wiring harness or near the seat structure, with a clearly marked 4-pin socket. This configuration:

• simplifies wire identification during installation or replacement,
• reduces the risk of incorrect connection,
• facilitates connection status checks during electrical diagnostics.

Thanks to the use of standard 12V voltage, the module works with factory system protections, such as fuses and additional relays in the electrical box. This allows for maintaining consistency with the original electrical system design and keeping predictable seat operating parameters.

Benefits of using an original Audi relay

Using a component from the Relays group dedicated to seats in Audi and Volkswagen vehicles translates into a number of practical operational benefits:

• preservation of the factory operating characteristics of the seat adjustment system,
• consistency with the original electrical harness and service diagrams,
• reduced risk of interference in other onboard electrical circuits.

The used component allows for an economical repair of the seat system while maintaining the original electrical design. This solution is particularly beneficial when restoring vehicle functionality after a relay failure, without the need to use unverified replacements.

Application in service and diagnostics

The seat relay module is an important control point during the diagnosis of seat power supply problems, such as lack of response to controls, intermittent operation of adjustment motors, or improper functioning of additional seat features. Replacing the relay with a functional unit allows for quick verification of whether the source of the fault is the module itself or other system components.

In service practice, using an original relay facilitates the use of the manufacturer's technical documentation and electrical diagrams, which shortens repair time and limits the number of trial modifications to the installation.

System expansion and selection of other relays

If you are planning a comprehensive repair or upgrade of the electrical zone in your Audi and need other elements from the same group, such as light relays, fan relays, or pump relays, check the available parts in the Audi Relays category.

When planning broader service work, it is also worth checking the guide on collecting used electrical and mechanical components in one place – you will find practical tips in the article Comprehensive supply: from the engine to the smallest clip – how to collect used car parts in one place?.