Airbag control unit with part number 6RA 959 653

What is the function of part 6RA 959 653?

The part number 6RA 959 653 does not refer to the central airbag control unit, but rather to the steering column coil spring assembly, also known as the clockspring. In the VW up! and e-up!, this component establishes the critical electrical connection between the rigid wiring harness and the rotating steering wheel, supplying the driver’s airbag, horn, and multifunction buttons with the necessary signals.

In the Safety Restraint System (SRS), the coil spring is an indispensable link. The central airbag control unit (ECU) is typically located in the center console and monitors the entire system. For it to be able to deploy the driver’s airbag in the event of a crash, the ignition circuit must remain closed via the coil spring. Therefore, a functional 6RA 959 653 is essential for the proper operation of the driver’s airbag.

Technically, the assembly consists of a plastic housing containing a coiled flat ribbon cable that compensates for the rotational movement of the steering wheel. Without this flexible connection, the cable would snap upon the first steering motion. Variants such as 6RA 959 653 A serve the same purpose and are structurally identical.

Why does the 6RA 959 653 coil spring fail?

The most common cause of failure for the 6RA 959 653 coil spring is mechanical damage to the internal flat ribbon cable. After hundreds of thousands of steering movements, the material becomes fatigued, leading to hairline cracks and eventually breaking the conductive traces. Improper installation—failing to observe the neutral position—can also overstress and damage the cable.

A typical technical finding is an open circuit in the driver’s airbag ignition circuit. This causes the airbag control unit to detect excessive resistance and store a fault code. Unlike a defect in the central control unit, which often comes with internal errors or stored crash data, communication with the control unit usually remains intact in case of a coil spring failure—only the signal path to the steering wheel is disrupted.

Other potential causes include defective or corroded connectors on the coil spring itself. Mechanical damage during disassembly of the steering wheel or airbag is another frequent source of issues, often invisible from the outside.

How can you recognize a defect in part 6RA 959 653?

The clearest symptom is the permanently illuminated airbag warning light on the instrument cluster. Additionally, the horn or the multifunction buttons on the steering wheel may stop working. The airbag control unit’s fault memory typically contains entries such as “Driver’s Airbag Igniter – Open Circuit” or “Resistance Too High.”

During a workshop diagnosis, the central airbag control unit will respond, but report a fault in ignition circuit 1 (driver’s side). This error cannot be cleared as long as the electrical break persists in the coil spring.

In rare cases, the fault may appear intermittently, indicated by the airbag warning light flickering on and off. This suggests an incipient cable break or a loose connection in the connectors.

In which vehicles is the 6RA 959 653 coil spring installed?

At Airbag24, we repair airbag coil springs with part number 6RA 959 653 and related variants specifically for certain models within the Volkswagen Group. This component is primarily found in the small car segment and plays a crucial role in these vehicles’ occupant protection systems.

Repair services for this part are mainly offered for the following models:

Volkswagen: e-up! AA (model years 2013–2019) and the e-up! AA facelift (model years 2019–2023).

Additionally, the coil spring is also used in conventionally powered VW up! models built on the same platform.

How is part 6RA 959 653 professionally repaired?

After being sent to Airbag24, the 6RA 959 653 coil spring undergoes a professional repair process. It begins with an incoming inspection and disassembly of the housing. Next, the delicate flat ribbon cable is examined for breaks and kinks, and if necessary, expertly repaired or replaced. We provide a 12-month warranty on all repairs.

Removal and installation in the vehicle must be performed exclusively by trained specialists. Important safety precautions must be observed, such as disconnecting the vehicle battery with the ignition on and avoiding electrostatic discharge. Especially for electric vehicles like the e-up!, the high-voltage system must first be safely disconnected.

The electronic refurbishment includes checking all conductive traces for proper continuity and resistance. Damaged connector pins are replaced, and contact surfaces are cleaned. After reassembly, the correct neutral position of the coil spring is verified to prevent subsequent damage after installation. Finally, an electrical functional test ensures that all signal paths operate flawlessly again.

What shipping options are available at Airbag24?

To send your defective component to Airbag24, you can either ship it to us yourself free of charge or arrange a convenient UPS pickup from your preferred location. For returning the repaired part, we offer several options, including free standard UPS shipping as well as faster express and cash-on-delivery services.

Outbound shipping to the repair service:

- Free shipping via self‑shipping or drop‑off

- Arranging a UPS pickup from a location of your choice

Return shipping of the repaired part:

- FREE standard UPS shipping (1–3 business days)

- UPS express shipping (1–2 business days)

- UPS standard shipping with cash on delivery (1–3 business days)

- UPS express shipping with cash on delivery (1–2 business days)

- Local self‑pickup