Airbag control unit with part number 8635A422

What does the airbag control unit 8635A422 do?

In vehicles from Mitsubishi, the airbag control unit 8635A422 coordinates the SRS restraint system. It reads the crash sensors, decides within milliseconds during an impact whether airbags and seatbelt pretensioners fire, and checks the system continuously. If it detects a fault, the airbag warning light comes on.

After an accident, it writes crash data to its memory and then locks itself.

This monitoring runs in the background throughout every journey.

Why does the control unit 8635A422 fail?

Stored crash data is the most common cause, even if no airbag was deployed in the accident. A standard diagnostic tool cannot reach this data, so it remains in the memory. At Airbag24, the data is deleted during the repair.

Aged electronic components, cold solder joints, and moisture and corrosion at plug connections can also trigger the fault.

Voltage spikes, for example from a weak battery or a jump start, are also a conceivable cause.

How can you tell that the 8635A422 is defective?

A defect in the 8635A422 shows up as the airbag warning light in the instrument cluster, as error messages and as a disrupted diagnosis. Typical signs are:

• The light in the instrument cluster stays on permanently.
• The light flashes or only comes on intermittently.
• An error message appears in the instrument cluster.
• The diagnostic tool cannot find the control unit.
• The fault memory cannot be cleared.

If such a fault persists, airbags and seatbelt pretensioners may not deploy in an emergency.

Which vehicles is the 8635A422 fitted in?

The 8635A422 is fitted in these vehicles: Mitsubishi Eclipse Cross GK (from 2018).

The list below shows which vehicles belong to this part number:

• Mitsubishi Eclipse Cross GK (from 2018)

Compare the part number on the label of your removed unit with this page; that way you know it is the right control unit. Have the fault memory read out beforehand, because only the log shows whether the control unit is defective or whether a plug or cable is the cause.

How does the repair of the 8635A422 work?

The repair of the 8635A422 begins with having the fault memory read out and attaching the log; then disconnect the battery and remove the control unit. Next, create the repair order online and send in the well-packed unit. At Airbag24, testing, repairing and checking usually take 3–4 working days, after which the unit is returned.

In the process, we replace defective components, delete the crash data and carry out a function test.

Our repairs come with 2 years' statutory liability for defects.

The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 8635A422 get to Airbag24?

The control unit 8635A422 reaches Airbag24 as a parcel, or you can book a UPS collection for an extra charge. After the repair, you receive it back by UPS.

Print out the repair order and put it in the parcel; pack the unit so that it is shock-resistant.