Airbag control unit with part number P8635A307

What does the airbag control unit P8635A307 do?

The airbag control unit P8635A307 is the component that controls triggering in the restraint system (SRS) for Mitsubishi. It evaluates the signals from the crash sensors, decides in an accident within fractions of a second on airbags and seatbelt pretensioners, and monitors the system during operation.

The control unit detects faults in the system itself and keeps them in the fault memory. They become visible via the airbag warning light in the instrument cluster.

After an accident, it stores crash data and locks itself in the process.

Why does the control unit P8635A307 fail?

Stored crash data from an accident is the most common cause with the P8635A307, even if no airbag was triggered at all. Aged components, moisture and corrosion on plug connections, and voltage spikes are also to be considered.

The following further triggers play a role:

• aged electronic components
• moisture and corrosion on the contacts
• voltage spikes, for example from a weak battery
• cold solder joints

Crash data cannot be deleted with a normal diagnostic tool. The entry therefore remains in place, and it is one of the first points to be checked during the search.

How can you tell that the P8635A307 is defective?

The airbag warning light in the instrument cluster lights up continuously or only intermittently on this P8635A307. In addition, an error message appears in the instrument cluster, the diagnostic tool cannot reach the control unit, and a fault memory cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then not be able to trigger. The display therefore calls for prompt clarification.

Whether the control unit or a cable is the cause cannot be determined without reading out the fault memory.

Which vehicles is the P8635A307 fitted in?

The P8635A307 is fitted in these vehicles: Mitsubishi Lancer CY (2007-2017).

The following list shows the vehicles in which the control unit is fitted.

• Mitsubishi Lancer CY (2007-2017)

First compare the part number on the label of the removed unit with this page. This only ensures that it is the right unit. Independently of this, have the fault memory read out, because only this log shows whether the control unit is defective or a cable is the cause.

For the same vehicles, we also repair control units with the part numbers P8635A146, P8635A168, TARME1308R0924, TARME2937R0152.

How does the repair of the P8635A307 work?

First you read out the fault memory and enclose the log, then you disconnect the battery and remove the control unit P8635A307. You then create the repair order online. At Airbag24, processing usually takes 3–4 working days.

The unit you send in first goes to the test bench. There, defective components are repaired, the crash data is deleted and a function test is carried out before your own unit is returned.

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 P8635A307 get to Airbag24?

Either you send the control unit P8635A307 in as a parcel, or you book a UPS collection for an extra charge. Airbag24 sends it back to you after repair by UPS.

Pack the unit shockproof and enclose the printed repair order.