Airbag control unit with part number 8635A491

What does the airbag control unit 8635A491 do?

The airbag control unit 8635A491 belongs to the restraint system (SRS) of Mitsubishi and performs its evaluation. The crash sensors report events to it, and from these it calculates within fractions of a second which airbags and seatbelt pretensioners are triggered. It monitors the system continuously and shows faults via the airbag warning light.

After an accident it stores crash data and then locks itself.

It is the central component of the system, even though sensors and airbags also belong to it.

Why does the control unit 8635A491 fail?

The most common cause is crash data stored after an accident, even if no airbag was deployed in that accident, because a normal diagnostic tool cannot erase it. Other possible causes are aged electronic components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes from a weak battery or a jump start.

Crash data is created in the control unit itself when it evaluates an accident, and afterwards lies in its memory.

The other causes act over a longer period: components age, solder joints become brittle, and plug connections absorb moisture.

How can you tell that the 8635A491 is defective?

The airbag warning light in the instrument cluster stays on permanently or lights up from time to time, and a fault message is visible there. The diagnostic tool then cannot find the control unit, and the fault memory cannot be cleared.

In the event of a defect, airbags and seatbelt pretensioners may fail to deploy in an emergency. That is what makes the warning so important.

The light is the visible sign that the system has detected a fault, and it must not be overlooked.

Which vehicles is the 8635A491 fitted in?

The 8635A491 is fitted in these vehicles: Mitsubishi L200 KL (2015-2023), KK (2015-2023) and KJ (2015-2023).

A list of the vehicles for this part number follows here:

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

Comparing the part number on the label of the removed unit with this page ensures that it is the correct unit, nothing more. Have the fault memory read out beforehand, because only this result shows whether the control unit itself is defective or whether a plug 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 8635A491 work?

You have the fault memory read out and enclose the log. Then you disconnect the battery, remove the control unit, create a repair order online and send in the well-packed unit. Airbag24 checks it, replaces defective components, erases stored crash data and tests the function.

The test bench check comes first at Airbag24. Afterwards your own unit is returned to you, and processing usually takes 3–4 working days; this time covers only the work at Airbag24.

The order serves safety: the control unit is only removed after the readout and after the battery has been disconnected.

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 8635A491 get to Airbag24?

The route to Airbag24 is either a parcel that you send yourself, or a UPS collection that you book for an extra charge. Airbag24 uses UPS for the return.

Put the printed repair order into the parcel and secure the unit shock-resistant.