Airbag control unit with part number 8635A227

What does the airbag control unit 8635A227 do?

The airbag control unit 8635A227 is responsible for the restraint system (SRS) in Mitsubishi. It processes the signals from the crash sensors, determines within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors everything continuously. After an accident, it stores crash data and locks itself.

The unit reports faults via the airbag warning light, which you can see in the instrument cluster.

Why does the control unit 8635A227 fail?

Crash data from an accident is the most common cause with 8635A227, even if no airbag has triggered. A standard diagnostic tool cannot erase it. Other causes concern the electronics themselves and their connections.

Airbag24 deletes the crash data during the repair.

• aged electronic components
• cold solder joints
• moisture and corrosion on plug connections
• voltage spikes, for example from a weak battery or jump starting

Which of these applies is shown only by the read-out fault memory together with the check at Airbag24.

How can you tell that the 8635A227 is defective?

An airbag warning light in the instrument cluster that stays on permanently or only intermittently is the first warning sign with 8635A227. Added to this may be a fault message in the instrument cluster, connection problems with the diagnostic tool, or a fault memory that cannot be cleared. In an emergency, airbags and seatbelt pretensioners may then fail to deploy.

The light shows the finding directly, so you do not have to track it down yourself.

Reading out the fault memory is what determines whether the control unit is faulty or a connection is the cause.

Which vehicles is the 8635A227 fitted in?

Not all Mitsubishi models are equipped with this control unit. 8635A227 is installed only in this vehicle: Mitsubishi i-MiEV HA3W (2009-2020).

The list below shows the vehicles for which we have records for this number.

• Mitsubishi i-MiEV HA3W (2009-2020)

Comparing the marking on the removed unit with this page only confirms that it is the right unit. Have the fault memory read out before that, because only the log shows whether the control unit is defective or whether a plug or cable is responsible.

For the same vehicles, we also repair control units with the part numbers 8635A317, 8635A387, W2T67472, W2T67571.

How does the repair of the 8635A227 work?

First, have the fault memory of the 8635A227 read out and attach the log. Then disconnect the battery and only afterwards remove the control unit. Next, create the repair order online and pack the unit carefully. At Airbag24, checking, repairing and testing usually take 3–4 working days.

Airbag24 checks the unit on the test bench, replaces defective components, deletes stored crash data and carries out a function test. After that, your unit is returned to you.

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 8635A227 get to Airbag24?

You send a parcel to us yourself, or you arrange a UPS collection for an extra charge. After the repair, the control unit 8635A227 reaches you again by UPS.

The printed repair order goes into the parcel, and the unit must be packed shockproof.