Airbag control unit with part number 8635A155

What does the airbag control unit 8635A155 do?

The airbag control unit 8635A155 is the main control unit of the restraint system (SRS) in Mitsubishi. It processes signals from the crash sensors, decides within milliseconds which airbags and seatbelt pretensioners to trigger, and monitors the system continuously.

During operation it checks the connected components. If it finds a fault, it stores it and shows it via the airbag warning light in the instrument cluster.

After an accident it stores crash data and then locks itself. Only the repair lifts this lock.

Why does the control unit 8635A155 fail?

With the 8635A155, the most common cause is crash data stored after an accident, even if no airbag was triggered. Other possible factors include aged components, cold solder joints, moisture and corrosion, and voltage spikes.

Crash data cannot be erased with a standard diagnostic tool. Airbag24 erases it during the repair.

Other causes include ageing electronic components. Solder joints can go cold, and at plug connections moisture and corrosion lead to faults. Voltage spikes, for example from a weak battery or a jump start, can also damage the unit.

How can you tell that the 8635A155 is defective?

A defect shows up as an airbag warning light that stays on permanently or intermittently. Other signs are an error message in the instrument cluster, no connection to the diagnostic tool, and a fault memory that cannot be cleared.

Typical signs are:

• The airbag warning light in the instrument cluster stays on or keeps coming on.
• An error message appears in the instrument cluster.
• The diagnostic tool gets no connection to the control unit.
• The fault memory cannot be cleared.

Such signs mean that airbags and seatbelt pretensioners may not trigger in an emergency. Please have the finding checked promptly.

Which vehicles is the 8635A155 fitted in?

The 8635A155 was fitted in the following vehicle: Mitsubishi Grandis NA (2003-2011).

The list below shows the vehicle stored for this part number.

• Mitsubishi Grandis NA (2003-2011)

Compare the part number on the label of the removed unit with this page; this only confirms that it is the correct unit. Have the fault memory read out beforehand, because only its log shows whether the control unit is defective or whether a connector or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 2489104, MN141401, W2T62674.

How does the repair of the 8635A155 work?

First have the fault memory read out; the log is part of the package. Then disconnect the battery and remove the 8635A155. Then create a repair order online and send in the well-packed unit.

At Airbag24 the unit is checked and defective components are repaired. Airbag24 then erases the stored crash data and carries out a function test.

Processing at Airbag24 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 8635A155 get to Airbag24?

You send the 8635A155 by parcel or book a UPS collection for an extra charge. After the repair, Airbag24 returns the unit by UPS.

The printed repair order goes into the parcel. Pack the unit shock-proof.