Airbag control unit with part number 8635A123

What does the airbag control unit 8635A123 do?

The airbag control unit 8635A123 acts as the central unit of the restraint system (SRS) at Mitsubishi. It reads the crash sensors, determines in an accident within a fraction of a second which airbags and seatbelt pretensioners are triggered, and logs faults. After an accident, it stores crash data and locks itself.

In normal operation it remains inconspicuous. If it detects a fault, it causes the airbag warning light in the instrument cluster to light up. The lock after the accident is ended only by the repair.

Why does the control unit 8635A123 fail?

The most common cause with the 8635A123 is that crash data were stored after an accident, even without a triggered airbag. A diagnostic tool does not remove them. Further causes are aged components, cold solder joints, moisture and corrosion, as well as voltage spikes.

Airbag24 removes the crash data during the repair. The other causes at a glance:

• aged components in the electronics
• cold solder joints on the circuit board
• moisture and corrosion at plug connections
• voltage spikes, for example from a weak battery or a jump start

How can you tell that the 8635A123 is defective?

A defect on the 8635A123 is recognised mainly by the airbag warning light, by fault messages in the instrument cluster or by a diagnostic tool without contact to the control unit. In this condition, airbags and seatbelt pretensioners may possibly fail to trigger in an emergency.

The signs include:

• warning light that lights up permanently or now and then
• fault message in the instrument cluster
• diagnostic tool without connection
• fault memory that cannot be cleared

The warning light reports exactly such faults. Have it checked as soon as it comes on.

Which vehicles is the 8635A123 fitted in?

The control unit 8635A123 is found in these vehicles: Mitsubishi Pajero Sport KH (2008-2015). Whether your vehicle is one of them is shown by comparing the number on the unit with this page.

The vehicles stored for this part number are listed here:

• Mitsubishi Pajero Sport KH (2008-2015)

The fault memory must be read out before removal: its evaluation shows whether the unit itself is affected or whether a plug or cable is the cause. Comparing the part number, on the other hand, is only done to make sure it is the correct unit.

For the same vehicles, we also repair control units with the part numbers 8635A143.

How does the repair of the 8635A123 work?

First comes reading out the fault memory, whose log is enclosed with the unit. Then you disconnect the battery and remove the control unit 8635A123. Afterwards, send the well-packed unit in with a repair order created online. Airbag24 usually requires 3–4 working days for this.

The sequence serves safety on the vehicle. In the examination at Airbag24, repairs are made to defective components, the crash data are removed and the function is tested.

Afterwards your own unit goes back 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 8635A123 get to Airbag24?

You send the control unit 8635A123 as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 sends it back to you by UPS.

Place the printed repair order in the parcel and pack the control unit shock-proof.