Airbag control unit with part number 8635A426

What does the airbag control unit 8635A426 do?

The airbag control unit 8635A426 controls the restraint system (SRS) in vehicles of Mitsubishi. It evaluates the signals from the crash sensors continuously and decides in a crash which airbags and seatbelt pretensioners are triggered. It indicates any faults via the airbag warning light.

The decision is made within milliseconds, so that the triggering happens in time. Between accidents the unit monitors the entire system.

Only once it has registered an accident does the unit store crash data and lock itself. The lock is lifted only by the repair.

Why does the control unit 8635A426 fail?

The most common cause in the 8635A426 is crash data stored after an accident, even without a deployed airbag. Other causes are components that age, moisture and voltage spikes.

A normal diagnostic tool cannot erase this crash data. Further causes that also come into consideration are:

• components that age
• corrosion and moisture at plug connectors
• cold solder joints
• voltage spikes, for example from a weak battery or a jump start

Which cause applies in the individual case is shown only by the inspection.

How can you tell that the 8635A426 is defective?

A defect on the 8635A426 shows itself through the airbag warning light in the instrument cluster, which is either permanently lit or only intermittently lit, and through a fault message there. In addition, if the diagnostic tool cannot connect to the control unit or the fault memory cannot be cleared, that is a sign of a defect.

In an emergency, airbags and seatbelt pretensioners may not trigger, so take the warning light seriously.

A detected fault therefore appears visibly in the instrument cluster. Which component is affected is determined only by reading out the fault memory.

Which vehicles is the 8635A426 fitted in?

The control unit 8635A426 is fitted in these vehicles: Mitsubishi Space Star A00 1st Facelift (2016-2019), A00 (2012-2016) and A00 2nd Facelift (from 2019). What counts is the number on the unit, not a rough model designation.

The following list shows the vehicles assigned to this number:

• Mitsubishi Space Star A00 1st Facelift (2016-2019)
• Mitsubishi Space Star A00 (2012-2016)
• Mitsubishi Space Star A00 2nd Facelift (from 2019)

Both points in advance: compare the label on the removed unit with this page, and then you know it is the right unit. Have the fault memory read out beforehand, because it shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 8635A234, 8635A374, 8635A377, 8635A393, 8635A396, 8635A409.

How does the repair of the 8635A426 work?

First have the fault memory read out and enclose the log. Then disconnect the battery and remove the control unit 8635A426. Next create the repair order online and send the well-packed unit in.

At the test bench Airbag24 inspects the unit, replaces defective components, erases the crash data and carries out a functional test. After that you receive your own unit back.

At Airbag24 the processing time is usually 3–4 working days. 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 8635A426 get to Airbag24?

The unit 8635A426 goes to Airbag24 either as a parcel or via a UPS collection booked for an extra charge. The return after the repair is made by UPS.

A printed repair order belongs in the parcel, and the unit must be packed shock-proof.