Airbag control unit with part number P8635A128

What does the airbag control unit P8635A128 do?

The airbag control unit P8635A128 is the control unit of the restraint system (SRS) in Mitsubishi. It processes the signals from the crash sensors, decides within milliseconds in a crash whether airbags and seatbelt pretensioners are triggered, and monitors the entire system. It reports faults via the airbag warning light.

Monitoring runs continuously, so also when there has been no accident.

After an accident, the unit stores crash data and locks itself.

Why does the control unit P8635A128 fail?

The most common cause is crash data stored after an accident, even if no airbag fired. A normal diagnostic tool does not remove this data. Other causes include ageing components, cold solder joints, moisture and corrosion on plug connections, and voltage spikes.

Voltage spikes arise, for example, when the battery is weak or when a jump start is given.

Ageing components and cold solder joints also count among these causes.

How can you tell that the P8635A128 is defective?

You can recognise a defect mainly by the airbag warning light in the instrument cluster, which stays on permanently or comes on intermittently. A fault message in the instrument cluster, a failure to establish a connection to the diagnostic tool and a fault memory that cannot be cleared also point to a problem.

As long as these irregularities persist, airbags and seatbelt pretensioners may not trigger in an emergency. A prompt check is therefore recommended.

Which vehicles is the P8635A128 fitted in?

The P8635A128 is found in these vehicles: Mitsubishi Outlander CW (2006-2010) and CW Facelift (2010-2012).

The overview as a list:

• Mitsubishi Outlander CW (2006-2010)
• Mitsubishi Outlander CW Facelift (2010-2012)

Compare the part number on the label of the removed unit with this page, and then you know that you have the correct unit. Whether the control unit itself is defective or a connector or cable is the cause is shown only by the fault memory, so have it read out beforehand.

For the same vehicles, we also repair control units with the part numbers 285011150, 285011151, 8635A215, 8635A221, 8635A282, 8635A283.

How does the repair of the P8635A128 work?

You first have the fault memory read out and attach the log. Then you disconnect the battery and only after that remove the control unit. Afterwards you create a repair order online and send in the well-packed unit.

Airbag24 first examines the unit on the test bench, replaces defective components and erases stored crash data. This is followed by the function test, and your own unit is sent back to you.

For testing, repair and the function test at Airbag24, 3–4 working days are usually allowed. 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 P8635A128 get to Airbag24?

You can either send the unit as a parcel or use a UPS collection booked for an extra charge. After the repair, UPS brings your unit back.

The printed repair order goes into the parcel, and the control unit is packed shockproof.