Airbag control unit with part number AS 4679

What is the function of the AS 4679 airbag control unit?

The airbag control unit (SRS ECU), part number AS 4679, is the central control module of the passive safety system primarily installed in the Chevrolet Traverse. It evaluates data from crash sensors and, in the event of a collision, activates essential restraint systems such as airbags and seatbelt pretensioners.

As the “brain” of the safety system, it continuously monitors all connected components—from impact sensors at the front and sides of the vehicle to individual airbag modules and seatbelt pretensioners—ensuring flawless operation when needed.

A key function of the AS 4679 control unit is storing crash data after an airbag deployment. This storage serves as a safety measure: the system locks itself and requires a diagnostic check to prevent further driving with a potentially non‑functional restraint system.

Why does the AS 4679 control unit fail?

The most common cause of failure for the AS 4679 control unit is the permanent storage of crash data following an accident, which intentionally locks the system. Other defects may arise from internal electronic malfunctions or improper removal and installation.

After a collision in which the airbags have deployed, the control unit writes an irreversible fault record into its memory. This entry permanently disables the entire SRS system, indicated by the illuminated airbag warning light. Consequently, the airbags will no longer activate in subsequent collisions.

Besides this primary cause, other risks can also lead to failure. Electrostatic discharge (ESD) during removal without proper protective measures can damage the sensitive circuit board or memory chips. Similarly, mechanical damage to connection pins caused by improper handling can disrupt communication.

In diagnostic tools, the crash record often appears as error codes such as “internal error” or “crash event stored.” For comparable systems, codes like 65 3 550 are known to indicate an irreparable fault within the control unit.

How do you recognize a defect in the AS 4679 control unit?

A defect in the AS 4679 airbag control unit is mainly signaled by the persistently lit or flashing airbag warning light (SRS light) on the instrument cluster. Additionally, the fault memory often cannot be cleared, or the control unit becomes inaccessible to diagnostic equipment.

The most obvious symptom is the active SRS indicator lamp that remains illuminated even after the engine has started. This alerts the driver to a critical fault in the restraint system, posing a risk to occupant safety.

During professional diagnostics at a workshop, specific error codes are read out, directly pointing to the control unit. Entries indicating stored crash data or an internal hardware fault confirm the defect and the need for repair.

In which vehicles is the AS 4679 control unit installed?

The airbag control unit with part number AS 4679 is specifically designed for Chevrolet vehicles. It is predominantly used in first-generation Chevrolet Traverses, including the facelift model.

At Airbag24, we repair the AS 4679 control unit for the following models:

Chevrolet Traverse (1st generation, model years 2008–2013)

Chevrolet Traverse (1st generation facelift, model years 2013–2017)

How is the AS 4679 control unit repaired?

Professional repair of the AS 4679 involves a precise electronic process. After careful removal and shipment, the unit is analyzed in our lab, where all stored crash data is completely erased. This restores the control unit to its factory condition, making it fully functional again.

The process begins with safely removing the control unit from the vehicle. To avoid residual currents, the vehicle’s battery must be disconnected for at least 10 minutes. The control unit is typically located beneath the rear seat or behind the trunk lid.

Upon receipt at Airbag24, our technicians perform a diagnosis to verify the fault. Using specialized equipment, they then erase the crash data from the control unit’s memory chip, returning the software to its pre‑accident state.

Following successful repair, the unit is ready for reinstallation and requires no additional coding at the workshop. After installation and clearing the fault memory in the vehicle, the airbag warning light should extinguish as expected within seconds. We provide a 12-month warranty on all repairs.

Is it Worth Repairing the AS 4679 Control Unit?

Yes, repair is an extremely cost-effective and sensible solution. It saves you up to 90% compared to a new part, which can cost as much as €750. Additionally, there’s no need for expensive re‑coding at a specialist workshop, since the original unit remains intact.

The biggest advantage is the substantial cost savings. Rather than purchasing an expensive new part and paying extra for its programming, repair restores full functionality at a fraction of the price.

A repaired control unit is “plug-and-play.” As it’s the vehicle’s original component, all vehicle‑specific configurations are preserved. Once reinstalled, the system is ready to use immediately.

Repair is a proven, reliable process. The performance of the refurbished control unit is identical to that of a new part. To protect your investment, we offer a 12‑month warranty on our work.

What Shipping Options Does Airbag24 Offer?

Airbag24 provides flexible and secure shipping options. You can either send your defective control unit yourself or take advantage of our convenient UPS pickup service. For returns, we offer free standard UPS shipping, as well as express and cash‑on‑delivery options.

For outbound shipments, you can drop off the package with a carrier of your choice or bring it in person. Alternatively, you can arrange a convenient UPS pickup from any location you prefer.

After repair, we ship the control unit back to you free of charge via standard UPS delivery. If you need it faster, express UPS shipping is available.

For flexible payment, both standard and express shipping are offered with cash‑on‑delivery options. Personal collection of the repaired unit at our facility is also available at any time.