Audi A3 8P Front Door Card Wiring Loom Cable Harness Passenger Side 8P3971035S

Audi A3 8P Front Door Card Wiring Loom Cable Harness Passenger Side is an original electrical installation component designed for factory installation in the front door. As part of the Wires, harnesses and connectors group, it ensures organized signal routing and a stable connection between the door and the rest of the vehicle's electrical system, which translates into reliable operation of the door electronics.

Specifications and technical data

• SKU: RHD-8P3971035S
• Mark: Audi
• Condition: Used
• OEM Part Number: 8P3971035S
• Substitutable numbers: 8P3971035S, 8P3 971 035 S
• Location on the vehicle: Front
• Part type: Wire Harness
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented harness is designed for installation in the front passenger side door of the Audi A3 8P generation model. It is responsible for the electrical connection between the modules and components installed in the door (such as window controls, mirrors, or central locking) and the vehicle's main electrical system, enabling their correct and repeatable operation. Thanks to its factory fitment for the specific body version, the harness routes wires in the locations intended by the manufacturer, which reduces the risk of abrasion, short circuits, and issues with loose connectors within the door area.

Construction and technical advantages

The door harness is constructed as a complete, ready-to-install solution, including wires and appropriately selected connectors for the passenger door installation. The applied wire architecture enables:

• stable routing of electrical signals between the door and the body,
• secure connection with factory control modules,
• compliance with the original Audi A3 8P electrical schematic. As an original Audi component, the harness ensures proper fitment of length, wire cross-sections, and connector types, which facilitates installation and eliminates the need for any modifications to the electrical system.

Service application and installation

This front passenger side door harness is particularly suitable for situations where the existing installation has suffered mechanical damage, contact corrosion, or improper repairs. Using an original harness allows you to restore:

• proper operation of the door electronics,
• consistency of the installation with factory service documentation,
• operational safety due to proper wire routing. The item comes from the Wires, harnesses and connectors group, which means it is intended for operation within the vehicle's electrical system environment and has been designed for a durable connection of components within the door.

Benefits of using an original Audi harness

Choosing an original door harness for the Audi A3 8P brings a number of practical service benefits:

• Compatibility with factory equipment – the harness is prepared for original modules and door accessories, which facilitates diagnostics and subsequent repairs.
• Reduction of electrical problems – proper shielding, wire cross-sections, and connector quality reduce the risk of faults related to circuit interruptions or interference.
• Consistency with service documentation – the wire layout corresponds to the diagrams used in authorized service centers, which speeds up workshop work. If you are planning a comprehensive repair or upgrade of the front door area in your Audi and need other components from the same group, such as additional harnesses, wires, or door installation connectors, check the available parts in the Audi wires, harnesses and connectors category.