Airbag control unit with part number 8635A304

What is the function of the airbag control unit 8635A304?

The airbag control unit with part number 8635A304 is the central control module for the entire occupant protection system in the Mitsubishi Outlander of the GF generation. It is responsible for detecting crash situations, activating the necessary restraint systems such as airbags and seatbelt pretensioners, and continuously monitoring the system status.

This control unit constantly processes data from various crash sensors distributed throughout the vehicle. In the event of a collision, it determines within milliseconds which airbags (front, side, and curtain airbags) and seatbelt pretensioners need to be deployed to provide optimal protection for occupants.

In addition to its activation function, module 8635A304 also performs continuous self-diagnosis. If it detects a fault in any connected component or in the control unit itself, this is signaled to the driver by the illumination of the airbag warning light (SRS warning light) on the instrument panel.

What defects occur in 8635A304?

Typical defects of control unit 8635A304 include stored crash data after an accident that prevents further operation, internal hardware failures on the circuit board, and communication malfunctions via the CAN bus. Damage caused by overvoltage can also lead to complete failure of the module, necessitating repair.

One of the most common reasons for repair is the storage of crash data. After an airbag deployment, the control unit is internally locked to prevent unintended re‑deployment. This condition can be reset through professional repair without requiring an expensive new part.

Internal faults are often due to defective electronic components such as processors, memory chips, or capacitors. These hardware defects prevent proper functioning and result in persistent error messages within the system.

Another defect manifests as a loss of communication. The control unit then becomes unresponsive to diagnostic tools, indicating a fault in the CAN‑bus transceiver or in the unit’s power supply.

The control unit 8635A304 is also known under equivalent part numbers MR587732, MR587868, 8635A215, 8635A221, 8635A282, 8635A283, 8635A305, and 8635A306. The fault patterns are identical across these variants.

How do you recognize a defect in control unit 8635A304?

A defect in the airbag control unit 8635A304 typically becomes apparent through a permanently illuminated or flashing airbag warning light (SRS light) on the dashboard. Additionally, the control unit may no longer respond to diagnostic equipment, or specific error codes indicating an internal fault may be stored.

The clearest indication is the active SRS warning light. It signals a critical fault in the restraint system that requires immediate inspection. As long as this light remains on, the airbags cannot function properly, posing a significant safety risk.

In the workshop, the defect often shows up as an inability to establish communication with the control unit. Diagnostic attempts fail, and no error codes can be read or cleared. This points to a severe internal malfunction.

If error codes such as “Internal Control Unit Fault” or similar are retrieved, this directly indicates a hardware defect. Such errors cannot be resolved simply by clearing them and require electronic repair of the module.

In which vehicles is control unit 8635A304 installed?

The airbag control unit with part number 8635A304 is specifically designed for various model years of the third-generation Mitsubishi Outlander (GF). It is used in pre-facelift vehicles as well as in both revised versions, ensuring broad coverage within this model series.

At Airbag24, we repair control unit 8635A304 and its equivalent numbers for the following Mitsubishi models:

Mitsubishi Outlander GF (model years 2012–2015)

Mitsubishi Outlander GF 1st Facelift (model years 2015–2018)

Mitsubishi Outlander GF 2nd Facelift (model years 2018 and later)

How does the repair of 8635A304 proceed?

The repair of control unit 8635A304 at Airbag24 follows a systematic process. After a thorough incoming inspection, the specific defect is localized at the component level. This is followed by professional electronic repair, deletion of any stored crash data, and a final functional test.

Upon receipt of the removed control unit, specialized technicians conduct a detailed analysis to precisely identify the root cause of the fault. Both the symptoms described by the customer and the retrieved fault data are taken into account during this process.

The actual repair focuses on the circuit board’s electronics. Defective components are replaced, and any stored crash data is securely and completely erased as needed. This restores the control unit to its original, fully functional condition.

Before being returned, each repaired unit undergoes rigorous functional testing on a specialized test bench. This ensures that, after repair, the control unit performs just like a brand-new part. All repairs come with 2 years' statutory liability for defects.