Airbag control unit with part number 8635A489

What does the airbag control unit 8635A489 do?

The 8635A489 is the airbag control unit of the restraint system in Mitsubishi vehicles. It evaluates the crash sensors, determines in milliseconds in an accident which airbags and seatbelt pretensioners to trigger, and monitors the system continuously. After an accident, it stores crash data and locks itself.

It indicates faults via the airbag warning light in the instrument cluster.

The decision is made in the unit itself, because there is no time for queries in an accident.

Why does the control unit 8635A489 fail?

The most common reason for a failure of the 8635A489 is crash data stored after an accident, even without a deployed airbag. Further causes may be ageing components, cold solder joints, moisture or corrosion at plug connections, and voltage spikes.

Crash data cannot be removed with a normal diagnostic tool. It therefore stays in the memory of the control unit.

Components change over time, solder joints can go cold, and plug connections absorb moisture.

Voltage spikes arise, for example, from a weak battery or jump-starting and can stress the electronics.

How can you tell that the 8635A489 is defective?

A defect on the 8635A489 shows up as the airbag warning light in the instrument cluster staying on permanently or intermittently. A fault message in the instrument cluster, a missing connection of the diagnostic tool to the control unit and a fault memory that cannot be cleared are also present.

Because the vehicle reports the defect itself, prompt clarification is worthwhile.

In an emergency, airbags and seatbelt pretensioners may fail to deploy if the control unit is not working perfectly.

Which vehicles is the 8635A489 fitted in?

The 8635A489 is fitted in these vehicles: Mitsubishi L200 KL (2015-2023), KK (2015-2023) and KJ (2015-2023). Use the label on the removed unit to check whether the number matches this page.

Here is the list of vehicles:

• Mitsubishi L200 KL (2015-2023)
• Mitsubishi L200 KK (2015-2023)
• Mitsubishi L200 KJ (2015-2023)

There are two steps. First, comparing the number on the label makes sure you have the right unit. Second, have the fault memory read out beforehand, because only this shows whether the control unit is defective or a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 8635A362, 8635A364, 8635A434, 8635A440, 8635A522.

How does the repair of the 8635A489 work?

On the 8635A489, you first read out the fault memory and enclose the log. Then disconnect the battery, remove the control unit and create the repair order online. Then send in the well-packed unit.

Airbag24 checks the unit on the test bench, repairs defective components, erases stored crash data and carries out a function test. Checking, repairing and testing there usually takes 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 8635A489 get to Airbag24?

You send the 8635A489 to Airbag24 as a parcel, or have it collected by UPS for an extra charge. After the repair, Airbag24 sends the unit back to you by UPS.

Pack it shockproof and enclose the printed repair order.